TSS9122I - TSSENQ: UNABLE TO ENQ ON ACID aaaaaa, ENQ HELD ON SYSTEM ssss

Products

• Top Secret
• Top Secret - LDAP

Issue/Introduction

TSSENQ on the Security file

We received this message:
TSS9122I - TSSENQ: UNABLE TO ENQ ON ACID aaaaaa, ENQ HELD ON SYSTEM ssss
*TSS9123A - UNABLE TO OBTAIN SECURITY FILE ENQ. 070
TSS9123A - SYSTEM ssss HAS HELD LOCK FOR 001 MINUTES
TSS9123A - IF SYSTEM ssss IS NOT OPERATIONAL
TSS9123A - REPLY 'RESET', OTHERWISE REPLY 'WAIT'.
TSS9123A - WARNING: INDISCRIMINATELY REPLYING 'RESET'
TSS9123A - MAY CAUSE CORRUPTION OF THE SECURITY FILE
*39 TSS9123A - REPLY 'RESET' OR 'WAIT' SYSID

After while the system issued a cancel:

TSS9122I - TSSENQ: UNABLE TO ENQ ON ACID aaaaaa, ENQ HELD ON SYSTEM ssss
IEE400I THESE MESSAGES CANCELLED - 39. IEE400I THESE MESSAGES CANCELLED - 42.

We are trying to understand why it was unable to ENQ on ACID aaaaaa and what
exactly was it trying to ENQ on? And what was the ENQ that ssss held?
​What caused this and what is the correct response?

Environment

z/os

Resolution

The most common cause is a batch job doing a lot of TSS administration (ie TSS LIST(ACIDS) DATA(ALL) or a bunch of TSS commands).
Other causes could be a backup being taken while some other type of commands are issued or a batch job running.