We have configured a job with "Perforce" as source code management, where we haven't defined the depot setting (In this case it is picking perforce setting from environment variable). This is working fine.

Problem has started when i configured a script on PostBuildScript. This script do some checkin on perforce after build. This script is not working when executing under Jenkins while i am able to use same script from the console.
Here is error -

Perforce client error:
Connect to server failed; check $P4PORT.
TCP connect to perforce:1666 failed.
connect: perforce:1666: Connection refused
Perforce client error:
Connect to server failed; check $P4PORT.
TCP connect to perforce:1666 failed.
connect: perforce:1666: Connection refused

Value for P4PORT environment variable using by this script (perorce:1666 as shown in logs) and set value in Jenkins are different.
That mean PostBuildScript doesn't pass the environment variable to script which it execute.