CCI is issuing numerous CAS9899W "Heart Beat timeout" messages and appears to hang

Products

• COMMON SERVICES FOR Z/OS
• 90S SERVICES
• COMMON PRODUCT SERVICES COMPONENT
• Common Services

Issue/Introduction

While executing the Common Services CCITCPGW/CCISSLGW proc, the job hung causing CCI connections to fail.

The joblog shows multiple  CAS9899W "Heart Beat timeout" messages.  What can be causing this message and how can it be corrected?

Environment

Release : 14.1 and 15.0 

Component : CCI - COMMON COMMUNICATION INTERFACE 

Cause

The tasks that CCI was servicing had a WLM class of STCHI while ENF and CCI were running at STCMED.

The dispatching priority for CCI was too low which could have caused the wait.  

Resolution

Check the WLM class of both the ENF and CCI components. Ensure that the dispatching priority of both tasks are equal to or greater than any tasks they are servicing. 

Additional Information

Reference the Common Services z/OS documentation for the proper WLM settings when Configuring CCI.