Server Down - Getting error Tomcat is down or refused connection

[IS_9105880]

I am using Windchill PDMLink Release 11.1 and Datecode with CPS M010

Frequently server getting down.
Getting error(Tomcat is down or refused connection)

Here are the errors that I faced
Tomcat is down or refused connection.No response has been sent to the client

[VladimirN]

Similar discussion - "Windchill 10.X with imbedded tomcat issues": https://community.ptc.com/t5/Windchill/Windchill-10-X-with-imbedded-tomcat-issues/td-p/214137

[BenLoosli]

Sounds like an issue you need to take up with your IT department.

Are Apache, Windchill and your LDAP being run as services on the host system?