Can't contact LDAP server Fortigate60F

[Acxelsus]

Hi,
Our LDAP server is working before, but after we change our ISP the errors occurs (Can't contact LDAP server).
We can still ping our AD from firewall, and ping firewall from AD.

[btey]

Hi Acxelsus, 

You may verify the connection to LDAP server with the following command:

# diagnose sniffer packet any "host x.x.x.x and port yy" 4 

Replace x.x.x.x to the LDAP server IP and yy to the LDAP port .

- verify the outbound interface

- verify if any response from the LDAP server

Please check if the following article relevant to your scenario:

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Status-of-LDAP-server-connected-via-...

[Acxelsus]

This is the response

[btey]

Hi Acxelsus, 

What is firewall firmware version?

You may try to run httpsd debug to check the LDAPS negotiation or you may try disable server-identity-check

config user ldap
edit xxx>>> Server Name
set server-identity-check disable
end

For httpsd debug:

# diagnose debug application httpsd -1

# diagnose debug enable

Test the connection again. To stop debug:

# diagnose debug disable

# diagnose debug reset

For your reference:

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Configuring-LDAP-over-SSL-LDAPS/ta-p/18997...

https://community.fortinet.com/t5/Fortinet-Forum/Cannot-contact-LDAP-server/td-p/90065

[Acxelsus]

The firmware version is 7.0.5



Still the same, can't contact the ldap server

[btey]

Please ensure the CA certificate is correct.

You may perform packet capture for the LDAP connection to get more detail.