The ldap error that you are seeing is related to defect #38532. This defect is fixed on AsyncOS 5.5.1-011, which should be available to your machine.
Also, you can get the Release notes for 5.5.1-011 and get more details on this defect. If you go to the ( Support Portal > Email ) and the release notes should be available there.
Here is a snippet of the release notes that pertain to your defect.
Fixed: LDAP Connection Closes Are Not Handled Properly
Fixed an issue in which LDAP connections were not closed properly, causing problems in the work queue. This issue has been addressed. [Defect ID: 38532]
Hello!
Recently we got two C350 set up as a cluster with LDAP validation enabled.
We are receiving following critical message:
Subject: Critical (IronPort device name) An application fault occurred: ('ldap/ldap_client.py state_t...
The Critical message is:
An application fault occurred: ('ldap/ldap_client.py state_to_timeout|118', "", "'NoneType' object has no attribute 'wake_all'", '[ldap/ldap_client.py sg_thread_bootstrap|995] [ldap/ldap_client.py sg_thread_worker|1247] [ldap/ldap_client.py state_to_timeout|118]') An application fault occurred: LDAP_Ironport:10.32.35.44(10.32.35.44:389) (595) ('_ldap.pyx _ldap._TLV|217', "", 'expected string or Unicode object, NoneType found', '[ldap/ldap_client.py writer|2659] [ldap/ldap_client.py _rendered_packet_from_inquiry|2770] [ldap/ldap.py encode_message|228] [_ldap.pyx _ldap.SEQUENCE|340] [_ldap.pyx _ldap._SEQUENCE|262] [_ldap.pyx _ldap._TLV|217]') An application fault occurred: LDAP_Ironport:10.32.35.45(10.32.35.45:389) (226) ('_ldap.pyx _ldap._TLV|217', "", 'expected string or Unicode object, NoneType found', '[ldap/ldap_client.py writer|2659] [ldap/ldap_client.py _rendered_packet_from_inquiry|2770] [ldap/ldap.py encode_message|228] [_ldap.pyx _ldap.SEQUENCE|340] [_ldap.pyx _ldap._SEQUENCE|262] [_ldap.pyx _ldap._TLV|217]') An application fault occurred: LDAP_Ironport:10.32.35.45(10.32.35.45:389) (258) ('_ldap.pyx _ldap._TLV|217', "", 'expected string or Unicode object, NoneType found', '[ldap/ldap_client.py writer|2659] [ldap/ldap_client.py _rendered_packet_from_inquiry|2770] [ldap/ldap.py encode_message|228] [_ldap.pyx _ldap.SEQUENCE|340] [_ldap.pyx _ldap._SEQUENCE|262] [_ldap.pyx _ldap._TLV|217]') An application fault occurred: LDAP_Ironport:10.32.35.46(10.32.35.46:389) (217) ('_ldap.pyx _ldap._TLV|217', "", 'expected string or Unicode object, NoneType found', '[ldap/ldap_client.py writer|2659] [ldap/ldap_client.py _rendered_packet_from_inquiry|2770] [ldap/ldap.py encode_message|228] [_ldap.pyx _ldap.SEQUENCE|340] [_ldap.pyx _ldap._SEQUENCE|262] [_ldap.pyx _ldap._TLV|217]') An application fault occurred: LDAP_Ironport:10.32.35.47(10.32.35.47:389) (345) ('_ldap.pyx _ldap._TLV|217', "", 'expected string or Unicode object, NoneType found', '[ldap/ldap_client.py writer|2659] [ldap/ldap_client.py _rendered_packet_from_inquiry|2770] [ldap/ldap.py encode_message|228] [_ldap.pyx _ldap.SEQUENCE|340] [_ldap.pyx _ldap._SEQUENCE|262] [_ldap.pyx _ldap._TLV|217]')
LDAP_Ironport.accept
(proxyAddresses=smtp:{a})
LDAP_Ironport.group
(&(memberOf={g})(proxyAddresses=smtp:{a}))
Any idea what the problem may be?
