Today our IWP stopped working (overnight) yet no warning received from the FM Server error services, the Web engine was still running on the FM Admin Console, we also run a 'PHP' version simultaneously.
Windows Server 2008 R2
FM Server Advanced 12v4
After a few hours of various tests resulting to nothing, we open the IIS server and 'turned on' Trace Failed Request. It restored the IWP instantly.
Anyone has an idea why this would cause IWP to faile?