When assigning a 2nd domain, connection cannot be made and times out with an error if a port is specified. If I remove the port it connects fine. However after saving, the plugin automatically puts the default port 3268 at the end. It is written to the config.xml and if a restart of the jenkins service happens, once more users cannot login.
So this prevents anyone from the 2nd domain to login to the Jenkins server which is blocking us from joining the two user forests.