Error Aprove Process

Document ID : KB000093079
Last Modified Date : 26/04/2018
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Issue:
We have a process where we need to aprove or reject a deployment but in both cases we get a Server Error without description I attach the screen.
Environment:
Release Automation 6.4, 6.5
Cause:
During investigation we identified that there is a proxy in between end-user and NAC a.k.a. DMS server. All the request is going via proxy. We validate that POST call of REST API call via REST client is correct getting processed and been reflected with correct status at ROC.

The approval happening via ROC UI itself is only having the issue, which on further analysis was identified that the PUT operation been disabled at proxy. When end user using ROC UI approving an approval it is PUT request which due to PUT operation disabled at Proxy is not getting processed.
Resolution:
The issue can be resolved by enabling PUT operation to went via proxy