Windows

Slow gigabit ethernet

The Windows Audio service depends on the Multimedia Class Scheduler service, which throttles back potential true gigabit performance while any audio is being played to prevent audio dropouts.

• Fix for slow Vista Network Transfer while playing Music
• Vista MMCSS gigabit throttling a victim of hard-coding, jumbo frames to the rescue!

Unable to access shares on a Vista/7 server from XP

Client error message "The specified server cannot perform the requested operation"

Wireshark analysis shows "Out of memory" error returned by server, which is actually the case.

Resolution: on the server, restart the "Server" service.

• TCP Checksum failed error between XP & Vista

Error while editing Local Security Policy on XP

When opening "User Rights Management" or "Security Options", one is presented with:

The group policy security settings that apply to this machine could not be determined., and perhaps also The parameter is incorrect.

The Windows Database in %windir%\security\database\secedit.sdb was likely not cleanly shutdown. Repair it with esentutl.

• Cannot open Local or Group Security Policy Console

Atheros L1 Gigabit NIC

Even with latest driver (2.4.7.29), Task Offload (hardware TCP checksum calculation) produces incorrect results as confirmed by Wireshark with TCP checksum checking enabled.

• Disable Task Offload in driver's Advanced property page.

Server 2008 R2 x64

500.19 Error When Enabling 32-bit Application Pool

WSUS is installed and has added 64-bit 'suscomp.dll' compression filter, which will cause this error when WoW pool is used: http://www.system-center.me/miscellaneous/http-error-500-19-internal-server-error-after-installing-wsus-x64/

Either put 32-bit suscomp.dll into C:\Windows\SysWOW64\inetsrv or disable compression scheme: http://forums.iis.net/p/1149768/1871292.aspx

This scenario is common when setting up FrontPage Server Extensions (FPSE): http://forums.iis.net/p/1159434/1911106.aspx

503 Service Unavailable

Show in body of browser as "HTTP Error 503. The service is unavailable."

32-bit app pool trying to load 64-bit modules referenced by applicationHost.config: http://www.mosmar.com.au/chris-blog/2011/3/15/taking-care-of-bitness-or-how-to-run-a-32-bit-app-with-owa-2.html

Use preCondition="bitness64" directive to only engage those modules when the app pool is running in 64-bit mode.