I had to update steam today. Now whenever I try to join the servers i get this:

Network: IP 192.168.1.8, mode MP, dedicated No, ports 27015 SV / 27005 CL
Connecting to 74.86.102.230:27015...
Invalid Steam key size.
Connecting to 74.86.102.230:27015...
Invalid Steam key size.
Connecting to 74.86.102.230:27015...
Invalid Steam key size.
Connecting to 74.86.102.230:27015...
Invalid Steam key size.
Connecting to 74.86.117.157:27018...
Invalid Steam key size.
Connecting to 74.86.117.157:27018...
Invalid Steam key size.
Connecting to 74.86.117.157:27018...
Invalid Steam key size.


That was multiple attempts. What does an Invalid steam key size refer to?