3104060 - Work process in status "RUN" Action "ENQ"

Symptom

ASCS instance and Dialog instances are up and running but one or several work process are in status "RUN" Action "ENQ" forever

In the work process trace file (dev_w*) appear the following entries:

M EncIDoOAMReq: unable to parse message
E *** ERROR => EncCliIConnect: failed to connect to enqueue server at <enqueue server hostname>/sapdp<nr> through layer EncCli (rc=-3) [enccli.c 1084]
E {root-id=000D3A139A641EEC88EEE991604186FE}_{conn-id=00000000000000000000000000000000}_0
..

M EncPSetUnsupported: protocol violation (ENCPARAM_NOSUPPORT)
M EncOAMParamParse: error while parsing parameter ENCPARAM_SET_NOSUPP
M EncIDoOAMReq: unable to parse message
...
M EncFragRecv: failed to handle an incoming OAM request (rc -1)
M EncRecvParams: error received, rc -1
M EncNiConnect: parameter negotiation failed (NIESERV_UNKNOWN). Closing connection
M NiICloseHandle: shutdown and close hdl 34/sock 14

Environment

SAP Netweaver running with Standalone Enqueue server

Product

SAP NetWeaver all versions ; SAP S/4HANA all versions

Keywords

Hold ENQ, failed to connect to enqueue server, EncCli (rc=-3), unable to parse message, protocol violation , KBA , BC-CST-EQ , Enqueue , Problem

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