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  • You have external RFC client program which connects to SAP.
  • When there are multiple calls in parallel by RFC client program, you may face slow response or even timeout.
  • At the same time, you found the work process is in "On Hold" RFC status and in the gateway trace, you found the following error:

NiHLGetHostName: to get failed in xxxxms (tl=2000ms)
*** ERROR => NiHLGetHostName: NiPGetHostByAddr failed (rc=-1) [nixxhl.cpp   495]

SAP system is running on WINDOWs OS.

Reproducing the Issue
RFC calls in paralell.

External host name cannot be resolved in time.



  • As a workaround, you can add external host name to hosts file, if you have less terminals need to be added.


  • Disable Netbios over TCP/IP in Windows environments, please check note 1431619.