"ERROR [08001] [IBM] SQL30081N A communication error has been detected." when connecting to DB2 (4329697)

Receiving an

ERROR [08001] [IBM] SQL30081N A communication error has been detected. Communication protocol being used: "TCP/IP". Communication API being used: "SOCKETS". Location where the error was detected: "123.456.789.255". Communication function detecting the error: "selectForConnectTimeout". Protocol specific error code(s): "0", "*", "*". SQLSTATE=08001

when connecting to DB2 z/OS.

SOLUTION 1:

Please check the:
- IP-Address
- hostname
- port numbers
- passwords that were saved

If the above is correct:

1. Go to Tools | Options | Database | Timeouts
2. Set 'Connection Timeout' value to greater than the default (15 seconds) and retest (increase value further if necessary)