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answered Nov 28 '17

Uli gravatar image

Your client is trying to use plaintext LDAP on port 636/tcp. Normally this port is used for LDAPS. Therefore the server resets the connection as it doesn't receive a ClientHello packet (which is expected).

=> Check the client settings. Switch to port 389/tcp for plaintext LDAP or enable SSL/TLS for connections on port 636/tcp.

You can spot the bindRequest in Wireshark for your trace by using 'Analyze' -> 'Decode As...' -> Field: 'TCP port', Value: '636', Current: 'LDAP'

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Your client is trying to use plaintext LDAP on port 636/tcp. Normally this port is used for LDAPS. Therefore the server resets the connection as it doesn't receive a ClientHello packet (which is expected).

=> Check the client settings. Switch to port 389/tcp for plaintext LDAP or enable SSL/TLS for connections on port 636/tcp.

You can spot the bindRequest in Wireshark for in your trace by using 'Analyze' -> 'Decode As...' -> Field: 'TCP port', Value: '636', Current: 'LDAP'