Hello, I  am using "github pull request plugin " https://wiki.jenkins-ci.org/display/JENKINS/GitHub+pull+request+builder+plugin . Whenever I make a Pull request, the Jenkins job i have gets triggered ( which is good). BUT after a day or two, it starts complaining "Local Signature XYZ does not match with external Signature ABC" whenever I made a Pull Request.  Once I update the shared secret Between jenkins ( under configure system) and in Github ( under webhooks section), it starts to work  again . BUT after a day or two, same problem "Local Signature XYZ does not match with external Signature ABC".  

Can anyone please help here?

Thanks