3125994 - Connection issues between the application servers and the Standalone Enqueue Server

Work processes are stuck on Enqueue related actions for several seconds / minutes, leading to slow Enqueue response times.

The work processes' trace files log network disconnections related to the Enqueue, similar to the entries below:

[date and time]
M  ***LOG Q0I=> NiIRead: P=[IP address of ASCS server]:32XX; L=[IP address of app server:random port number]: recv (110: Connection timed out) [/bas/753_REL/src/base/ni/nixxi.cpp 5429]
M  *** ERROR => NiIRead: SiRecv failed for hdl 21/sock 13
    (SI_ECONN_BROKEN/110; I4; ST; P=[IP address of ASCS server]:32XX; L=[IP address of app server:random port number]) [nixxi.cpp 5429]
M  {root-id=000D3A0491471EEBA7D80B30D57F6502}_{conn-id=00000000000000000000000000000000}_0
M  *** WARNING => EncCliReq: close connection (broken). See SAP note 1943531 [enccli.c 679]
E  *** ERROR => EnsaCliDoRequest: DoRequest failed (rc=-1): 488 bytes on con. 0 in layer 0 (EncCli) (1/1) [ensacli.c 408]
E  *** ERROR => ENSA_Connect(): AlHARegisterComponent() failed with error 254 [ensaclnt.c   835]

---> XX in "32XX" stands for the ASCS instance number

Or like below:

[date and time]
M  EncCliReq: timeout on enqueue connection

Or like below:

E [date and time]
E  EnqChannel(133): fragment0 - receiving (5000 of 5000 ms timeout)
E  *** ERROR => EnqChannel(133): fragment0 - receive failed on hdl133 (rc=-5 => NIETIMEOUT) [EnqChannel.c 798]
E  {root-id=002248AEF2E21FE09CDAD99526ED8521}_{conn-id=002248AEF2E21FE09CDAD99526EDA521}_1
E  EnqChannel(-1): connecting to [Enqueue Server hostname]:sapdpXX (timeout=5000 ms)
E
E [date and time]
E  *** ERROR => EnqChannel(134): failed to initialize SSL on hdl134 (rc=-5 => NIETIMEOUT) [EnqChannel.c 193]

On the Other side of the connection, the Enqueue server, we might also find the disconnections for the exact same communications on "dev_enqio_<n>" trace files (for the Standalone Enqueue Server v1) or "dev_enqserver" (for the Standalone Enqueue Server v2):

[date and time]
[Thr ..] ***LOG Q0I=> NiIRead: P=IP address of app server:same/above random port number; L=IP address of ASCS server:32XX: recv (110: Connection timed out) [/bas/753_REL/src/base/ni/nixxi.cpp 5434]
[Thr ..] *** ERROR => NiIRead: SiRecv failed for hdl 547/sock 45
    (SI_ECONN_BROKEN/110; I4; ST; P=IP address of app server:same/above random port number; L=IP address of ASCS server:32XX)

• SAP NetWeaver based product
• ABAP Platform based product

On hold, running, ENQ, ENSA, 104: Connection reset by peer, 104, Connection reset by peer, SAPLSENA, TIME_OUT, work process on hold, enqueue, long running, work process is going on hold with enqueue response for long time , KBA , BC-CST-EQ , Enqueue , BC-CST , Client/Server Technology , BC-OP-NT , Windows , BC-OP-LNX , Linux , Problem