Issue with Tomcat7

[Syed Mudassir Ahmed]

Hi,
  I have two web applications deployed into tomcat 7.  Lets call them
WebApp1 and WebApp2.  I am invoking WebApp1 using a rest call thru JMeter.
WebApp1 internally calls WebApp2 for a service.

  We tried making 1000 calls from JMeter.  Unfortunately, for all the
requests we are getting 500 internal service error.  When we checked the
catalina file, we found connection refused exception.

  Can someone help us what wrong we are doing?

Thanks,