Got this error when trying to connect to our databases v8.1.1.48 on AIX.
I was able to login successfully earlier but not now.
Searched google and noticed quite a few DB2 users encountered similar problems. Talked to our network admin and he said the network is fine.

Please advise. Thanks in advance!

SQL30081N A communication error has been detected. Communication protocol
being used: "TCP/IP". Communication API being used: "SOCKETS". Location
where the error was detected: "". Communication function
detecting the error: "recv". Protocol specific error code(s): "*", "*", "0".