When you click Test connection to test the LDAP connection, an error appears:

Unable to connect to LDAP - LDAP => LdapConnectionError - <Error_details>

The Synctool fails to connect to the server. The issue could be related to the AD server, the authorized user, or the allowed connections between the Synctool server and the AD server.

Causes and solutions

Cause 1

The host name is incorrect.

Solution 1

Try the host name with and without the domain name. For example, use DC01 if the Synctool runs on the AD server. If it does not run on the AD server, try DC01.zivver.org.

Cause 2

The port number is not 636 (recommended) or 389.

Solution 2

Make sure to use port 636 (recommended) or 389.

Cause 3

A connection over port 636 or 389 is not allowed to the AD server.

Solution 3

Ask your network administrator to verify the firewall settings.

Cause 4

The Use implicit TLS setting does not match the port number.

Solution 4

Ensure Use implicit TLS is enabled for port 636 or disabled for port 389.

Cause 5

The authorized user name is incorrect.

Solution 5

• Check for typos.
• Try using a domain prefix. Example: ZIVVERTEST\serviceaccount.
• Try without a domain prefix. Example: serviceaccount.

Cause 6

The password is incorrect.

Cause 7

The authorized user cannot log in to the AD server because of security restrictions.

Solution 7

1. On the AD server, open ADUC.
2. Right-click the service account > Properties > Account > Log On To… A window opens showing the following information:
   • Whether the authorized user can log in (for example, to All computers).
   • Which DNS names are configured for computers the service account can access.

Cause 8

Windows blocks the Synctool executable file.

Solution 8

1. In the Windows file system, locate the executable file.
2. Right-click the file icon.
3. In the Properties window, select Unblock.