LDAP authentication for admins not working after FortiOS 7.4.4 update

[Magnitude_8]

After updating some firewalls to FortiOS 7.4.4 I am no longer able to log onto them using LDAP authentication. Local accounts are not affected.

I have tested my credentials on the LDAP server screen and confirmed that I can authenticate, so this looks like a bug in 7.4.4.

Anyone else experiencing this issue?

[DoubleP]

After upgrading to 7.4.5 my issue is gone. LDAP admin logins are working again.

[Magnitude_8]

According to @sferoz, certificate's chains should now be checked. So if you haven't installed the root CA certificate on your device, we have a new bug/change in behaviour in 7.4.5.

[Tarsis79]

Thanks for suggestions - After upgrade to 7.4.6 (!) I met this issue with LDAPS in IPSec dialup VPN - quick workaround was disable secure connection to LDAP and it works. 

When I add Root-CA of our AD, we solved problem with LDAPS in XAUTH.

Thnkas for help.

[mpandya]

you can follow article

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-FortiGate-LDAP/ta-p/196280