SAP Knowledge Base Article - Preview

1927855 - Impact of a local firewall on ICM - TREX


  • In TREXADMIN RFC Monitor you execute the ICM connectivity tests which fail with the following entries in the system log(SM21)...

TREX_ICM - Receive_Error
Remote communication failure with partner
>http://<TREXHOST>:30003/ICMConnectTest/HTTP Status 507: Kernel

  • In SMGW in the gateway trace dev_rd you see errors of the type...

*** WARNING => Connection request from (33/9487/0) to
host: <trexhost>, service: 30003 failed (NIECONN_REFUSED)

  • The RFC connectivity tests in TREXADMIN -> Connectivity works without issue




  • This KBA is primarily aimed at Windows Server hosts where the firewall is enabled automatically.
  • But the advisement holds equally for other OSs hosting TREX including Linux flavours - REDHAT is also subject to default activation of a local firewall.
  • This error is release independent.


SAP NetWeaver Enterprise Search 7.2 ; SAP NetWeaver Enterprise Search 7.3 ; SAP Netweaver Enterprise Search 7.0 ; search and classification engine (TREX) for SAP CRM 4.0


icm communications, windows server, NIECONN_REFUSED , KBA , BC-TRX-ENG , TREX Engine , Problem

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