Hosts File Disappearing?
Jun 7, 2011
We have a modified hosts file on each of the computers here at work. This way we can have multi servers, in multi locations that can all be used by everyone for email & our finance program.However, there is one user who the hosts file keeps disappearing. Over the last 2 days it has disappeared 3 times (at least).The user has ran the symantec corp antivirus (at least a couple of times). All risks found have been quarentined and deleted, ran again and nothing found. Also ran Malwarebytes, which was clean. And ran ComboFix.At this point the hosts file has been fixed after running ComboFix.
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Jun 16, 2012
anything I put into my hosts file, will not go through the Cisco RV220W router. This is part of the set up:
192.168.1.10 << RV220W
192.168.1. 15 << A client machine
192.168.1.99 << Internal DNS with forwarder to OpenDNS (208.67.222.222 & 208.67.220.220) + a laptop that's not on the internal network at all.
Now, the client machine and the laptop both have an entry in their hosts files:
174.156.12.81 insight.hello.com
From the laptop, I can both browse to insight.hello.com, and I can ping it in Xterm.
From the client machine (192.168.1.15) which is behind the Cisco Router/FW, I can ping insight.hello.com, but I can not browse to it. This is especially strange since the ping goes through the Router every bit as much as the http traffic does, so why is the router giving me a DNS error on that, but the ping goes through just fine?
The hosts file is supposed to supercede any other information from anywhere, so it out to not be a problem for the router either. Yet, it obviously is.
I have tried to disable the internal DNS server as well as OpenDNS and just run the ISP's DNS servers, but no change - I still get that blue DNS error screen from the CIsco router.
Above IP's & hosts are fictitious.
The hosts file doesn't get blocked in a sense, but what happens is that if you have "Content Filtering" checked - even without any rules - the router can not verify that 174.156.12.81 is in fact insight.hello.com in this case, since it doesn't exist in the public DNS system.
So, I unchecked Content Filtering and now it works as it should.
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Apr 13, 2011
Is it possible to edit the hosts file on an ACS 1121 server running ACS 5.2? Our problem is we have a single domain with multiple domain controllers at different sites. So when the ACS server tries connecting to the domain it randomly picks a domain controller which it can't connect to thus causing it to fail.
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Mar 23, 2012
When I map a network drive it disappears every time I reboot my computer how I can keep it from disappearing? I am running Windows XP Professional
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Dec 3, 2012
I have had the virgin media superhub on 30mb broadband for about a month and over the last week I have been disconnecting from my network up to as much as 3 or 4 times a minute or sometimes once in five minutes and other times it just vanishes from the network list for about 30 seconds then re-appears, sometimes when I disconnect it re-connects almost instantly other times I have to wait about a minute or sometimes even longer even though I can permanently see my neighbours network and my laptop does not have this problem.. I payed �50 for a new wireless card to try and fix the problem and it was fine for a few weeks now it is the same. Restarting the router makes no difference and this is happening all constantly over the last week without fail, i have tried updating my wireless drivers and using different wireless cards.
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May 9, 2012
It's been doing this for over 7 or 8 hours now. And no, there's no network connection, that's what the problem is here. This is a Windows XP desktop.Basically what it's doing is within a second, this icon disappears from the taskbar, then reappears, over and over again: When I hover over it, it gives me a message about not being connected. I can't get the exact message screencapped and I can hardly even read it, it disappears too quickly.Sometimes it gives me this instead, and the connection works, but only for as long as this icon is there:But it disappears too quickly for me to load any pages completely, so they always end up being incomplete pages. When I hover over this one, it says acquiring network address.When I click repair, it gets stuck on "renewing IP address" every time, without fail.
Previously the internet connection would drop occasionally, but restarting the computer has always brought it back. I have tried this countless times by now, I have tried clicking repair, I have tried resetting the router, I have tried manually removing the connection then reconnecting to it, I have tried command prompt and running through the ipconfig flushdns, release, and renew commands, I have tried logging on as a different user account, I have tried uninstalling my wireless adapter software then reinstalling it, I have tried using a different adapter [I get a different error with that one], I have ran a scan with Malwarebytes' Anti-Malware then retried all these things, but that didn't fix it either. If my brother wasn't asleep I'd be wiping the hard drive by now as a last resort. And I will be doing this first thing in the morning if it isn't fixed.
There is one other computer on the wireless network, and its connection never drops. Ever. It's a Windows 7 laptop. There are two other computers in the house, but they both connect using the ethernet cable, and those never drop, either. The two Wiis, the Xbox 360, and the 3DS also connect wirelessly, and one of the Wiis drops occasionally as well -- and it's not connecting right now, either.There is one more PC in the house, which also runs Windows XP, but I haven't gotten it to connect in weeks and I've pretty much given up on it. It'd be nice to get that to run, too, since I have to share this computer, but it's 7 years old, it's just too old and is stuck on "acquiring network address" with either adapter, if I'm remembering right.
This is everything I know. This problem is still occurring, and it just occurred randomly today, while the computer wasn't even in use. I can connect to the internet with a wired connection, but stretching the wire across the house isn't something the homeowner wants me to do, so I can't keep it permanently, as much as I desperately want to.I looked around at a few other threads and there was some sort of Wifi program I can install? But it won't install. Or rather, the .net framework is what's not installing. So I guess I can't use that. Hope it makes finding the problem still possible though, this is the only computer I have left since my other one won't connect anymore either.
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Aug 6, 2011
I've had a strange problem with my laptop for quite a while now. From time to time, my entire wi-fi capability vanishes. The green wi-fi light goes off and my Intel PROset/Wireless tells me that I do not have a wireless physical adapter installed.From there, I go to Network Connections. Sometimes, I can hit "repair" under Local Area Connection 3 and after some struggles, the green light will come back on. However, sometimes when I go to Network Connections, I cannot repair the Local Area Connection, because the 1394 Connection is no longer even listed and, from all ways of searching, doesn't even exist on my laptop.In that case, I have to restart my laptop. Sometimes, a restart works and the wi-fi capability magically returns. Sometimes a restart does not work, and I have to power off, wait, and power back on my laptop. And sometimes, I have to keep rebooting SEVERAL TIMES in a row before I get wi-fi back.
I'm not sure what to do for it, nothing has changed with the router or the location of the router. My laptop will be fine for a couple of weeks, or I may lose wi-fi ability a couple of times in a week or so. However, at the moment, I lose my wi-fi adapter frequently, often every two minutes to perhaps every ten minutes. It has "acted up" this badly only once before (probably a month ago), and I just keep rebooting for a couple of days until everything seemed to calm down. However, I can't keep just restarting my laptop every five minutes
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Oct 5, 2011
I have a Pix 501 vs. 6.3(3). I have made changes to some Access Rules that made other rules disappear. When I try to recreate them I get an error that includes "Possible duplicate entry" statement.
The rule appears to be active, so how can I resurrect it in my Access Rule list?
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Sep 24, 2011
I'm trying to diagnose & repair a problem with the built in wireless adapter on a gateway NV53. The OS is 64 bit Win 7. The computer isn't mine, I was just trying to repair it for a friend. Initially, the wifi worked fine; the disk drive seemed to have a bad laser or something, sometimes there were problems with printers, it was slow to start, etc., so I thought I would just backup everything, "restore to factory defaults" (reformat & reinstall OS from hidden partition), then copy everything back / reinstall programs. I wanted to reformat just to clean it up, etc. After reformatting and updating windows to the latest version, it seemed to work fine (I hadn't tested those other problems, they are unimportant). However, after the computer is on for awhile - anywhere from a few minutes to a few hours - the wireless adapter suddenly can't see any networks. There are several networks in the area, so I know it isn't a problem with my router (also, other comps. can see them all still) After awhile longer, the wireless adapter disappears completely from device manager. I think that when it initially loses track of all the networks, the mouse, typing, etc. slow down and have jerky movement for a minute (may be incidental). When I restart the computer, the adapter works fine again, but of course, only for awhile.
Things I've tried:
-Setting the power settings on the adapter (don't allow power saving to turn this off.. box)
-reformatting
-updating drivers
-updating windows
-running antivirus
-uninstalling the antivirus
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Aug 26, 2012
I am trying to set up a pair of 1941 routers in a HA configuration to act as L2L VPN gateways. The active router of the pair should distribute routes to the remote destinations using OSPF to internal routers. The VPN part is working fine and the routers are correctly advertising routes to internal hosts, however my problem is that when an IPsec sessions disconnect, the routes disappear and therefore internal hosts cannot reestablish a connection. If the remote end establishes a connection, the routes appear again and connectivity is restored.
My setup is as follows: (ASA) --> (pvpn01 & pvpn02 HA pair) --> (internet) --> (remote peer)
The other router in the pair has exactly the same config except with different interface IPs. The remote end is configured to talk to the HA address
91.216.255.248.The VPN routers are both running IOS version 15.0(1r)M9.
When I initially boot the routers, the route for 192.168.66.0/24 appears in 'show crypto route', and is advertised to neighboring routers. If I ping an address on that network an SA is established and stays active as long as there is traffic flowing. pvpn02#show crypto route
If I then stop traffic flowing over the tunnel and wait until the IPsec SA lifetime is expired, the route is deleted from the system routing table and therefore not distributed by OSPF. The result is that internal hosts cannot reestablish the tunnel as the other routers have no route to the 192.168.66.0/24 network.
Is this a bug, or is there another way to get the RRI routes to persist on the active router?
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Apr 26, 2011
Running OS X 10.5.8 on an old MacBook Pro on a wireless network. It might be relevant that I recently upgraded the wireless router and the DHCP-assigned IP addresses changed. Before that, everything worked reasonably well.
I can connect to the MBP from Windows 7 computers on the network, logging in with a user name and password, and access the files there as expected.
But the MBP disappears from Windows Explorer after a few minutes. I can usually add it back (always checking the box to remember it) but it just keeps disappearing. Sometimes when it disappears, I can't add it back and when I try, Windows Explorer says, "can't find."
How can I get this share to stick?
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Aug 17, 2012
The original network had a Zylex router, Netgear Switch. There was 2 pc's, one XP and Win 7. There is also 3 tills connected too. There is VPN network connected too. This emits a wireless signal to connect to a scanning gun and is also used to administrate the entire network. I was told by the Administrator of that network that it shouldn't interfere with the wifi network.
The job I was requested to do was to install 3 new wall plates as the Win 7 pc was using a Belkin wireless adapter. There was 2 put inside the office where the XP and Win7 pc's are located. The 3rd was just outside the office.
Now all the ethernet connections work 100%. The wifi is another story though. It will show up in the connect too, when you try connect it will disappear/no response from AP/connect then disappear, these are random too. No order to when each is error is displayed. Even when I put in another router the exact same issues happen.
I have tried to connect to both routers wifi when it wasn't plugged into the switch. Just the router's turned on with no cables plugged in separately of course, no joy same issue with both.
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Dec 13, 2011
I have new DIR-615 D-link router. Since we installed it the network has disappeared randomly off the available networks list, and when I try and open Google Chrome it says there's DNS error. Troubleshooting through windows networks doesn't work because it can't find any problems since my network doesn't even show up on the list. We've even done a factory reset and the problem persists, and it does this about once a day. Resetting the router temporarily fixes the problem. This problem is happening on all 3 laptops in our home, two of which run windows 7 and one which runs XP.
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Sep 15, 2012
The original network had a Zylex router, Netgear Switch. There was 2 pc's, one XP and Win 7. There is also 3 tills connected too.There is VPN network connected too. This emits a wireless signal to connect to a scanning gun and is also used to administrate the entire network. I was told by the Administrator of that network that it shouldn't interfere with the wifi network.The job I was requested to do was to install 3 new wall plates as the Win 7 pc was using a Belkin wireless adapter. There was 2 put inside the office where the XP and Win7 pc's are located. The 3rd was just outside the office.Now all the ethernet connections work 100%. The wifi is another story though. It will show up in the connect too, when you try connect it will disappear/no response from AP/connect then disappear, these are random too. No order to when each is error is displayed. Even when I put in another router the exact same issues happen.I have tried to connect to both routers wifi when it wasn't plugged into the switch. Just the router's turned on with no cables plugged in separately of course, no joy same issue with both.
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Jun 25, 2011
Desktop
Windows 7 64-bit -> cable directly to router
Laptop
Windows 7 64-bit -> wireless
Laptop
Windows 7 64-bit -> wireless
Playstation 3
-> Wireless
Xbox 360
LAN cable from router to 360
Scientific Atlanta 2203C modem to a Cisco Linksys E3000 wireless router.Ok, so if I turn everything on I can see all computers from all computers, but after a few hours/days (random time) everything disappears, and I have to unplug the router and then everything is back. Is there a way to stop this, and just have everything just be there all the time?
Code:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:UsersJohn>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : John-PC
Primary Dns Suffix . . . . . . . :
[code]....
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May 6, 2012
My new EA4500 works fine all day, both wireless and wifi, on both bands, but nearly every evening, the wifi signal disappears, as shown on a wifi app for my smart phone, but not on Issid on my laptop, strangely, and my PC laptop and iPad both disconnect, then reconnect. Smart phone disconnects too. It isn't like the signal drops in strength, it just goes away! I have tried various settings on modes, and bandwidths, I am using different SSID's on each band, WPA2 security with a long non-dictionary passphrase and MAC filtering. The hardwire connection works great at 30+ Mbps even when the wifi is disappearing from the wifi scanner and the wifi connections are dropping. In other words, the cable connection/modem is working fine, but the wifi radio signal stops or the SSID drops off the signal. I really can't tell, but I know it is becoming very frustrating. The old WRT54GS works fine if I put it back on-line in the evening when these things start to happen.
I have turned off everything I can think of in the house that transmits or might transmit, in case it is an interference thing. I have tried disabling the 5 GHz side, since I can't see what is happening on that band, and the last thing I tried was changing the MTU from 1500 to 1400. So far, the past evening, it was okay, but I am not confident it will stay that way.
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Dec 26, 2009
I have problem with using my dell studio 1537 with platronics pulsar 260 bluetooth stereo headphones. After some time listening music bluetooth just disappearing from system, bluetooth indicator is on and not reacting for wireless switch. My OS is Win7x64, mini-card driver 6.2.0.9000, bt audio driver 6.2.0.9500. With other bluetooth functions, such as bt mouse or pda sync, i have no problems.
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Jul 26, 2011
I am working on a Drupal site which is on a virtual server (the way it's been explained to me). I've been told I need to work with it through webdev. So I can copy a file off the server and onto my local machine. I make my edits and then try to upload it to the server. I get locked out with the message: Error 0x80070021: The process cannot access the file because another process has locked a portion of the file. I have tried shutting down my code editor, opening and closing the connection, tried different methods of reaching the server (Cyberduck and through Window's map network feature) to no avail. What can I do?
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Dec 9, 2011
How to get into the ip hosts on vista?
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Apr 14, 2013
I know that 255.255.255.255 is the broadcast address to send message to all hosts that are in LAN. what i want here is, i want to send a mail to all hosts using this address.
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Jul 7, 2011
I need a tool to find all the hosts connected on my network. I need something that will tell me the MAC and host type/name. I ran an IP Address tracker and got all the IPs in use, but that doesn't tell much beyond the IP address. Don't really need to do a full in-depth nmap port scan. My concern about using nmap is it can bog down a router...Although I can't say for sure if there are ways to scale the scan back in nmap so it won't cause any issues?
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Mar 4, 2011
I have several Cisco switches connecting our network. Switch N connects to the gateway, Switches Y & Z connect to some hosts. Switch N connects to Y and Y connects to Z. Assume our gateway IP is a Class B address with a netmask of 255.255.254.0 and all the hosts attached on switches Y & Z have static IP addresses assigned to them. This gateway connects to the internet.In addition to this IP address, some of the hosts also have a second IP address assigned to the same NIC. This IP is Class A (10.0.###.###) and have a netmask of 255.255.0.0 A second gateway address is not defined.
The hosts that have 2 IP's bound to their nic, use the 10. address to communicate with each other. (Programs running on the hosts are specifically configured to use 10. address).I have several questions regarding this setup:
1) Assume Host has only 1 IP (Class B) - if the destination is on the same network, does the host system send the packet to the gateway first to find the destination on the network or does the host send a "where are u" packet to the broadcast address to find the destination?
2) Assume Host as 2 IPs (Class A & B) - if the destination is a 10. address, how does the host go about finding it?
Since there is no Gateway defined for the Class A address, does the host simply send out a packet to the broadcast address for the Class A network? or does it go to the gateway defined in the Class B network as it was defined first (i'm assuming primary connection)
3) Assume Switch N's connection to Switch Y is disabled - how will this affect communication between hosts on Switches Y & Z that have a 10. IP trying to share data with each other, using the 10. Address. If the answer is this should not affect it, what additional circumstances are required that may cause the systems with a 10. address to be unable to communicate when the connection from Switch Y to N is terminated?]
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Aug 1, 2011
I am working on a Perl script to be ran on our different subnets to see what hosts are down (and make the assumption that if the host is down the IP address is free to be used). This is not being ran on a Linux system, so I can't use grep to filter out everything except down hosts. I know there are modules for Nmap that would make this task easier, but my plan is to install Nmap to our network monitoring server, compile the script for Windows, and have it create the report for what addresses are down. I don't want each person running the script to have to have all the modules installed, etc. Or can you compile the script with the modules in it?
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May 23, 2012
Do you have any suggest for network scanning software?Something who can find IP address and hosts in the network?
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Jun 17, 2011
So we have a cisco asa 5505. Once a day now (random times) it will suddenly be unreachable along with the hosts connected. If I console in and ping a host from the asa, suddenly it becomes reachable from the outside world again. My job prohibits me from posting the configuration online.
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Jan 30, 2012
I'm new to this site, fully Microsoft certified but only just getting in cisco and looking to pass my CCNA later this year. Actual commands and general use on Cisco's im quite good at but general networking knowledge on networking (subnetting and network layers) I kinda suck at so will be studying a lot on this side of things[CODE]
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Feb 23, 2011
for network 192.168.7.128/26 what is the first usable host IP address in decimal? What is the last usable host IP address in decimal?
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May 17, 2011
Trying to use the "File Operations" option to import hosts into ACS. I go through the wizard and click "Finish", the pop up goes blank and just hangs there. No errors are generated.
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Nov 13, 2012
Seems like something simple, but can't find on Cisco.com. What are the max SNMP hosts allowed on an ASA 8.2 code? That would be Polls and Traps?
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Dec 4, 2012
I am trying to block access to facebook and twitter on my router, to a certain range of ips, 192.168.1.8 - 254. I have been digging around and trying stuff but all I do seems to restrict everyone access to the internet.
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Mar 22, 2013
Why it makes problems to use a default route on a BGP-router (cisco 6500 with sup720 3bxl).Only a very few amount of hosts have that kind of problem and the 50% paket loss is only between this hosts. So another host has no loss to any of the affected hosts. looks for me like there is a problem in the CEF-table.The router has a BGP-fulltable. The gateway of last resort is only set for cases like a flapping BGP-route, so that the traffic is sent to a default next hop, because sometimes he knows a better route which isnt flapping.
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Jun 1, 2011
you can subnet to meet the number of networks required, or you can subnet to meet the number of hosts required. In which circumstances would you use either one? or are they both the same? am kinda confused.Is subnetting according to the number of hosts VLSM? and subnetting according to the number of networks required is not VLSM subnetting? Also I'm on CCNA 1 chapter 6, if the other CCNA 2, 3 and 4 has chapters explaining subnetting better cos It's totally confusing me atm.Also, is my understanding correct, when a company wants a LAN made, a network designer see's how many hosts they require in each of their LANS and then chooses an appropriate address class and subnets it? and to connect the LAN to the internet he implements NAT on the router that connects to the internet, and that router translates the internal addressing scheme that was created into a public registered IP address from an ISP? Also does he just make the address up? for example if he decides to use class C, he just picks any random number in the class C range and subnets it?
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Jul 24, 2011
I have a PC upstairs, let's call it (Peter-PC), my dad has a PC downstairs (Kris-PC) and I just setup a linux home server downstairs as well called (server).Now, Peter-PC is connected through Linksys powerline adapters to the router, and server and Kris-PC are connected directly to the router as well.Peter-PC stays constantly connected to the internet, only until Kris-PC is turned on, then Peter-PC connection goes mental and begins to disconnect, reconnect, can't ping the router. As soon as Kris-PC is turned off,Peter-PC is back to normal.However, if Kris-PC and server are both on, they both operate fine. Seems like Peter-PC is the only unfortunate one.I mean the powerline adapters have been working for over 3 years now, and the Powerline light is flashing meaning they are communicating, I highly doubt it's the adapters.
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