LDAP unable to work with multiple servers

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Yesterday our AD server went down, we have four of them (.10, .11, .12 & .13) and users were unable to use the WiFi.  Restarting the first server (.10) fixed the problem.  I assumed we hadn't had the other three servers entered in and the NAC was unable to use another server.  Here's the error message:

"Partial Loss of Contact to LDAP Service detected: Active Dir due to: URL: ldap://x.x.x.10:389 error: Communication failed to LDAP server."

I checked today and noted that in the Active Directory setup under LDAP configuration all four servers are listed.  

We have NAC manager and this is the first time we have run into this error.

Am I to assume that we can use the four servers and normally if one is down it will use the 2nd or 3rd or 4th server listed?

Just curious as to how to prevent this from occurring again.

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Stephen McGuire

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  • unsure about LDAP

Posted 1 year ago

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Keene, Scott, Employee NMS/GTAC

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You'd probably want to get a case started in GTAC if you see this occur again.  If you have more than one LDAP server in your configuration, NAC should try the next one once the first one is deemed to be unreachable.


Scott Keene
NMS/NAC Support