DFHIS1009 Unable to acquire IPCONN followed by DFHIS2010 for CICS IPIC connection

A dump was captured on the DFHIS2010 message.

I formatted the CICS trace in the IS2010 dump using IPCS command VERBX DFHPDxxx 'TR=1 (where xxx is your release level of CICS like 680 for CICS TS 5.1). The trace shows:

 DS 0005 DSSR  EXIT - FUNCTION(WAIT_MVS)  RESPONSE(OK)                    
  
 SO 0E03 SOUS  *EXC* -  ASYNCIO_REQUESTED_FUNCTION_ERROR  RETURN_VALUE(-1)
 RETURN_CODE(1127) REASON_CODE(00000000)                                 
   
 SO 0202 SOCK  EXIT  - FUNCTION(RECEIVE) RESPONSE(EXCEPTION)             
 REASON(TIMED_OUT) RECEIVE_BUFFER(211AB000 , 00000000 , 00010000)        
 
 WB 0701 WBCL  EXIT - FUNCTION(READ_RESPONSE) RESPONSE(EXCEPTION)      
 REASON(TIMED_OUT) BODY(2117B8A8 , 00000000 , 0000004A) STATUS_CODE    
 (0) MEDIATYPE()                                                       
 
 IS 050F ISCO  *EXC* - ISCER_TIMED_OUT - FUNCTION(ACQUIRE_CONNECTION)  
 IPCONN(SERS)  

The Return code 1127 (RC1127) in the exception (*EXC) trace entry indicates ETIMEDOUT. The ETIMEDOUT error suggests that there was no response to the outbound SYN packet to initiate the TCP connection. This might be the result of:

• Incorrect IP address specified in CICS web configuration.

• Intermediate firewall dropping the packet before it hits the server.

A TCP/IP packet trace indicated tons of re-transmits of the data without ACKs.

You should check to ensure that there have been no new rules to prevent data flow across the firewall.

Debbie McLaughlin
IBM CICS Level 2 Support