Failing signon when using CICS Transaction Gateway for connection to the host

Problem

When using CICS Transaction Gateway (CTG) for connection between server and host the signon to CICS may fail because of user ID and/or password defined in the ASF web client being incorrect. The failure to sign on is accompanied by the following error messages/symptom strings: 1. Windows as server platform (Note: userID/password verification by RACF requires the CTG connection to have been defined with ATTACHSEC=VERIFY.) DOC1116E The session could not be started. The explicit signon on the host for user ID xxx failed (com.ibm.doc.proxy.DocASFNoConnectionException: An CICS error occurred : Return Code ECI_ERR_NO_CICS Abend code AZI4) CICS Client Messages: CCL3288E Errors occured while communicating with a server using protocol driver " " CCL2006I Refer to the client error log for more details CCL2005I The client will continue Log entry: 01/20/04 15:06:36.296 [5894] DRV:CCL5815 TCP62: Session 022c-ASF33DB2 MPTNCONN rejected, Rc=0007,0000, sense data=08570003 01/20/04 15:07:36.328 [5894] DRV:CCL5815 TCP62: Session 023c-ASF33DB2 MPTNCONN rejected, Rc=0007,0000, sense data=08570003 01/20/04 15:07:57.343 [7405] CCL:CCL3315 Unexpected comms error (internal return codes 3288 , 4098) 2. z/OS as server platform (Note: userID/password verification by RACF requires the environment variable AUTH_USERID_PASSWORD having been set to YES.) DOC1116E The session could not be started. The explicit signon on the host for user ID xxx failed (com.ibm.doc.proxy.DocASFNoConnectionException: An CICS error occurred : Return Code ECI_ERR_SYSTEM_ERROR Abend code null) or DOC1116E The session could not be started. The explicit signon on the host for user ID {0} failed. (com.ibm.doc.proxy.DocASFNoConnectionException: An CICS error occurred : Return Code ECI_ERR_SECURITY_ERROR Abend code null)