TCP Window Scaling Factor Not Always Set In SYN Request?
Jul 10, 2011
I am facing strange behavior in Windows 7 and Windows Vista.I have a client program in my PC and server program outside network.I can see that some time TCP WINDOWS SCALING working and some time not.In first Log after 3 way handshakes established I can see data transfer happening bocs from log I can see it is settings SCALING factor.
But for some cases where I see that connection happened but data transfer not happening (May be my network does not work without Scaling..) I can see my WINSOWS TCP stack has not set SCALING in SYN request.Hence in 2 nd log I can see "Scale factor not supported"...though I enabled SCALING in my WINDOW .
You can see in 2nd log :: [ Win=8192 ( ) = 8192 ] - not settings scaling factor some time.How to fix this issue so that Windows 7 / Vista always set SCALING in SYN request.
My TCP Settings :::
Receive-Side Scaling State : enabled
Chimney Offload State : automatic
NetDMA State : enabled[code].....
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Feb 7, 2013
We have the 3750G with the IOS version 12.2(35)SE5. Does this IOS version and switch support the TCP Window Scaling detailed in this doc? The doc says Release 12.2(8)T. And I don't see the 3750G or the 2960G platforms listed in the doc.
[URL]
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More info:
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webvpn_portal.c:ewaFormServe_webvpn_login[1904]webvpn_portal.c:http_webvpn_kill_cookie[682]webvpn_portal.c:ewaFormSubmit_webvpn_login[1964]ewaFormSubmit_webvpn_login: tgCookie = 0ewaFormSubmit_webvpn_login: cookie = c98f3940ewaFormSubmit_webvpn_login: tgCookieSet = 0ewaFormSubmit_webvpn_login: tgroup = NULLTunnel Group: DefaultWEBVPNGroup, Client Cert Auth Failed!Embedded CA Server not enabled. Logging out the user.webvpn_portal.c:ewaFormServe_webvpn_login[1904]webvpn_portal.c:http_webvpn_kill_cookie[682]
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Some highlights from the config:
crypto ca trustpoint ASDM_pfirewall01.company.tld enrollment terminal fqdn pfirewall01.company.tld subject-name CN=pfirewall01.company.is,O=Company,C=IS,L=Reykjavik keypair company crl configurecrypto ca trustpoint ASDM_TrustPoint0 revocation-check crl none enrollment terminal crl configure no enforcenextupdate no protocol ldap no protocol scepcrypto ca trustpoint ASDM_pfirwall01.company.tld revocation-check crl enrollment terminal no client-types crl configurecrypto ca certificate chain ASDM_pfirewall01.company.tld certificate 02 30820598 30820480 a0030201 02020102 300d0609 2a864886 f70d0101 05050030 <snipped rest of cert> quitcrypto ca certificate chain ASDM_TrustPoint0 certificate ca 00e2a6f08003ded6c9 3082054e 30820436 a0030201 02020900 e2a6f080 03ded6c9 300d0609 2a864886 <snipped rest of cert> quitcrypto ca certificate chain
[code]....
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Windows is unable to connect to the selected network. The network may no longer in range. Please refresh the list of available networks, and try to connect again.This message poped up during connecting to a wireless network
[code]...
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