An error occurred while trying to retrieve audit trail for this instance. Please review log files for detailed reasons.

If you face this error while trying to access the BPM process instances in EM , there is a setting on the Adminserver that you need to increase. You should be seeing below error in admin server logs.

IOException occurred on socket: Socket[addr=egw-bpm1-mnad-nsc.wfs.com/10.10.224.65,port=8001,localport=43747]
 weblogic.socket.MaxMessageSizeExceededException: Incoming message of size: '10000080' bytes exceeds the configured maximum of: '10000000' bytes for protocol: 't3'.
weblogic.socket.MaxMessageSizeExceededException: Incoming message of size: '10000080' bytes exceeds the configured maximum of: '10000000' bytes for protocol: 't3'
at weblogic.socket.BaseAbstractMuxableSocket.incrementBufferOffset(BaseAbstractMuxableSocket.java:230)
at weblogic.rjvm.t3.MuxableSocketT3.incrementBufferOffset(MuxableSocketT3.java:351)

 To resolve this set the below setting to a higher value. 

 Maximum Message Size in the weblogic admin console by going to 
Servers >> MyServer >> Protocols >> General tab >> Max Message Size

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