When we tried to open Composer and runtime it didn't open. Error is displaying as "HTTP Status 404-Not Found"
@sankararaman Is this a fresh installation? Or was it working earlier and suddenly you started facing this issue? What is the status of tomcat service?
You're trying to open a particular mashup. Are you still getting an error when opening "plain" composer UI (i.e. https://tealums.titan.in/Thingworx )?
Does it affect other mashups, or they work correctly?
Before going further (this would require getting digging log files), I'd restart the system, if possible and check is the issue is gone.
It's hardly possible anything else without seeing log files for the system.
Did restarting Tomcat / ThingWorx resolve the issue?
If not, and the issue persists, it's hard to proceed further without seeing log files.