This is a simple symptom-cause-solution blog entry only. I hope these blogs will help fellow administrators.
The following exception occurs in WebLogic server logs. Most likely to occur during WebLogic server start-up, but similar exceptions may occur at other times.
java.net.ConnectException: t3://myserver:8000: Destination unreachable; nested exception is:
java.net.ConnectException: Connection refused: connect; No available router to destination]
This message (Connection refused: connect; No available router to destination) is a kind of "catch-all" exception message. There may be a number of causes, but essentially the application or server is attempting to establish a connection, but is unable to.
Check the following:
- The destination name resolves to an IP address
- The destination is "pingable"
- The destination port is open (use telnet, for example)