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07-05-2011, 07:51 PM
(This post was last modified: 07-05-2011, 07:51 PM by cookies911.)
Are you firewalled? Is your ports opened? You might want to verify the ports needed for SRCDs, then if it still doesn't work redownload the files and try again. I personally have not seen anything like this before...
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Feels like a case of damaged Steam content. Run hldsupdatetool.exe with the -verify_all parameter. It'll check all of the files you have against Steam's content. If for some reason that doesn't work, try a fresh install.