Messages XCOMM1467E and XCOMM0780E Txpi 234

Products

• XCOM Data Transport - z/OS

Issue/Introduction

Receiving the following messages in the XCOMLOG:

XCOMM1467E OMVS Error: EDC8124I Socket not connected. (errno2=0x749B0000)
XCOMM0780E Txpi  234: Error 1124 from getpeername; length : 28
XCOMM0666E TxpiInitConnection FAILED - UNKNOWN PARTNER - TERMINATING CONNECTION

 What is causing the messages and from where are they comming?

 

Environment

Release : 12.0

Component : XCOM Data Transport for z/OS

Cause

Port scanning is producing the error messages in this case. The messages are produced because the partner is closing the connection before XCOM can complete the connection in the server, hence why it appears as an unidentified IP address for the incoming connection.

Resolution

Contact the team responsible for setting the port scans  and verify if additional scan methods have been added which include closing the port immediately after initiating a connection. 

Make sure that those port scans are throttled as to not affect or overload the server, since this can comprise a high percentage of the work the XCOM server is doing. Aggressive scans can be counterproductive and affect your production workload.  

Additional Information

Always be on the lookout for such messages and involve the team responsible for setting the scans to make sure these are not an attempt to access the system from the outside via the XCOM listener ports.