server not respond, what should I check?

[t4nu]

Hi,
I have 2 environments (different folder with different port - I named them 8090 and 8001) within 1 tomcat. Everything went fine until last week which we cannot access one of the environment intermittently. What I mean is we can access 1 environment (8001) while we cannot access the other (8090).
I have to stop the service and start it again, even sometimes the service cannot be stopped.
What should I do to find out the cause of the problem?
Thanks in advance for the help.

[Jon]

First check the log files - in tomcat/logs.

[t4nu]

IC. Thanks.

First check the log files - in tomcat/logs.