Any issues with using LDAP on LINUX for GRC 5.2 UME?

Our company is converting our LDAP servers from AIX to LINUX. The DNS name used in our UME connection should not change. Are there any issues with using LDAP on LINUX? We are currently on GRC 5.2 SP9 (in the middle of upgrading to SP12).

Also, I have been trying to connect our test UME system to a test LDAP box that has already been converted to LINUX but keep getting a 'connection failed' error when I try to test it.

Do you have to reboot the server to test changing the LDAP connections? I've been trying it by going into UME, pulling up the LDAP tab, hitting the Modify button, entering the new userid and password for test LDAP, and hitting the Test Connection button. I've verified that this userid and password is correct for test LDAP.

Is there a way to get more information about why the connection failed?

Thanks.