Though not 100% related, I had this problem when trying to connect to a test DOD:S server of mine, while I was able to connect just fine to my production server. Deleting my Steam client's ClientRegistry.blob file fixed it. Give that a try.
Brian Smith wrote:
I have had a problem since the last update... when starting a "from scratch" or HL2DM project, I can compile but not run them. Steam says "STEAM validation rejected". However, I can play HL2/CSS/HL2DM just fine.
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