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himanshusince1989
himanshusince1989
Explorer
September 21, 2025
Question

FortiGate Unable to Connect to LDAP Server

  • September 21, 2025
  • 2 replies
  • 814 views

Hello,

 

I have a pair of 100F firewall configure in HA with Active/Standby and HA dedicated MGMT Revervation is also configured with ha-direct enable. I am tried putting the AD details in the fieldsa and under regular provided the AD Credentials Administrator, and trying to browse DN, but is is always says invalid LDAP Server.

 

Note : Windows is successfully authenticated to users.

 

 

2025-09-21_16-27-47.png

2 replies

Abin_FTNT
Staff
Abin_FTNT
Staff
September 21, 2025

Please try :-https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Status-of-LDAP-server-connected-via-IPsec/ta-p/195558

himanshusince1989
himanshusince1989Author
Explorer
September 21, 2025

Thank you for Response, I see that the MGMT interface is no more under root vdom so unable to add the source with DEDICATED MGMT INterface.

What Next

 

 

2025-09-21_22-34-27.png

tbarua
Staff
tbarua
Staff
September 21, 2025

Hi @himanshusince1989,
Can you confirm whether you are able to ping the LDAP server (by IP address or FQDN)?
If yes, could you also share the FortiGate firmware version you are running?

Please note that there is a known issue (1148845) where enabling HA-direct can cause LDAP connectivity problems.
This issue has been resolved starting from FortiOS v7.4.9 and v7.6.4 and later.

If your device is affected, try disabling HA-direct and then reconnecting to the LDAP server to verify if the issue is resolved.

 

If you have found a solution, please like and accept it to make it easily accessible to others.

thank you,

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