Hello,

I am having a similar issue to this ticket (JENKINS-45009).  However, I am version 2.6 of the AD Plugin., which is the latest version.  Domain Health is reporting that it is not able to resolve the domain DNS, Global Catalog is not exposed, and Ldap Catalog is not exposed.  Also on the "Configure Global Security" page...when I attempt to test a Domain..it states:

"domainName doesn't look like a valid domain name". 

This domain is valid.

We believe this is causing the following error when we deploy code:

03:43:30 FATAL: org.acegisecurity.AuthenticationServiceException: Failed to bind to LDAP server with the bind name/password; nested exception is javax.naming.CommunicationException: ****DomainIPAddress****:3268 [Root exception is java.net.SocketTimeoutException: connect timed out]
03:43:30 java.net.SocketTimeoutException: connect timed out

Submitting queries, however, works.