пт, 5 авг. 2022 г. в 10:58, Chandan Singh <chsi...@athenahealth.com.inva
lid>:
>
> Hi All ,
>
> I am facing issue while upgrading to tomcat 9.063 from 9.011 .  Application 
> is not coming up with 503 error  , neither do I see any error message in logs 
> file .

As you are getting an error 503 and not just a timeout with no
response, it likely means that Tomcat is up and running.

You can verify whether Tomcat is processing requests by looking into
an access log file (as generated by AccessogValve).

https://cwiki.apache.org/confluence/display/TOMCAT/Troubleshooting+and+Diagnostics#TroubleshootingandDiagnostics-CommonTroubleshootingScenario

If there are no errors, it likely means that there are some info /
success messages. Do you see the usual log messages that your web
application has started up, and running?

Best regards,
Konstantin Kolinko

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