PowerFlex 3.x: Presentation Server unlinks from MDM

The Presentation Server (mgmt-server) scaleio.log reports it is unlinking from the MDM.

/mgmt-server/logs/scaleio.log:2023-08-27 04:21:42,656 [LiveQueryQueueThreadV2|INFO |com.emc.vxflexos.webui.backend.connection.mdm.MdmLinkService.lambda$tryUnlink$38] Starting unlink from MDM

The PMDM events and trc logs report that it could not connect to the LDAP service.

PMDM events
2023-08-27 04:21:34.611000:0016332:MDM_CLI_COMMAND_RECEIVED         INFO     Command logout received, User: 'N/A'. [7529811]
2023-08-27 04:21:34.611000:0016333:CLI_COMMAND_FAILED               WARNING  Command logout was not successful. Error code: Invalid session. Please login and try again.
2023-08-27 04:21:34.619000:0016334:MDM_CLI_COMMAND_RECEIVED         INFO     Command login received, User: 'flexro@sio.lab'. [7529812] Login banner read and approved manually. Originating source IP: <IP_REMOVED>
2023-08-27 04:21:42.638000:0016335:CLI_COMMAND_FAILED               WARNING  Command login was not successful. Error code: Could not establish the connection with LDAP service. [7529812]

PMDM trc log
2023/08/27 04:21:42.637849 71d00001676f:mosLdap_Bind:00130: After ldap_sasl_bind - rc: -1, msg-id: -1 
2023/08/27 04:21:42.637857 71d00001676f:mosLdap_PrintError:00193: Error in: ldap_sasl_bind, rc: Can't contact LDAP server (-1)
2023/08/27 04:21:42.637860 71d00001676f:mosLdap_PrintError:00197: Additional information: (null)  
2023/08/27 04:21:42.637862 71d00001676f:mosLdap_Bind:00133: Failed to start async operation for username: <USER_REMOVED>
2023/08/27 04:21:42.638047 71d00001676f:mosLdap_SearchUserInDomainGroupsIntr:00581: User "<USER_REMOVED>" was found in 0 groups - search-user: flexro, bind-user: <USER_REMOVED>, rc: LDAP_SESSION_INITIALIZATION_FAIL, time: 8020 ms  
2023/08/27 04:21:42.638117 7f09c58c0db0:ldapAuthMgr_Authenticate:00742: LDAP authentication search for user: <USER_REMOVED> in domain: ldaps://ad.sio.lab didn't find any matches (LDAP_SESSION_INITIALIZATION_FAIL)
2023/08/27 04:21:42.638236 7f09c58c0db0:mosEventLog_PostInternal:00609: New event added. Message: "Command login was not successful. Error code: Could not establish the connection with LDAP service. [7529812]". Additional info: "" Severity: Warning

The Presentation Server UI will prompt to link a PowerFlex MDM.

In this scenario, the end-user is using LDAP authentication.

The Presentation Server has an 8-hour token from when a user logs in. After the 8-hour token expires, a subsequent login attempt is made. However, if this attempt fails to establish a connection with the LDAP service, it can lead to the Presentation Server becoming unlinked from the cluster.

Re-link the Presentation Server to the PowerFlex cluster via the web UI.