Dedicated/SRCDS: Unable to connect to GC/SOCache

[rwf93]

Using the following method provided in https://github.com/ValveSoftware/source-sdk-2013/issues/638, SRCDS/Dedicated instances are unable to properly connect to the GC/SOCache backend.

This is most likely caused by anonymous accounts not being able to interact with the GC or app 243750 (Source SDK 2013 Multiplayer). Anonymous accounts cannot download the sdk either (which provides some challenges for setting up dedicated servers). The other alternative is because the server is ran as insecure (which is a requirement to connect as the SDK client forces insecure).