System Error in Comm channel monitoring of RWB

Dear all,

I have a Proxy to webservice scenario (HCM-PI-SuccessFactors). At receiver side i am using SOAP AXIS adapter. In RWB, the status of the channel is green and running. But when i ping the channel, it shows System Error.

I have made changes in respective communication channels, activated and cleared the cache. Still same error.

Later taken complete restart of system. Still same error.

How to overcome this ?

Note : 1) End to end scenario is working fine

          2) Among the three trusted certificates installed, status of one certificate is showing warning (status: which will expire on may 5).

Regards

Uday