Why would our LDAP settings work for 1 environment but not the other?

Question

We have a test environment for Jira and a Production environment. We tested the ability to add our newly acquired Active Directory (LDAP), and it connected in the test environment. Now we are trying to move this over to our Prod environment and we get the error below.

Test basic connection : Failed

grcpdc1.grnriver.local:389; nested exception is javax.naming.CommunicationException: grcpdc1.grnriver.local:389 [Root exception is java.net.UnknownHostException: grcpdc1.grnriver.local]

Nic Brough -Adaptavist- · Answer

Your network is not resolving the name correctly.

On the failing server, it can't resolve grcpdc1.grnriver.local to any server.  Check DNS, and the local hosts file on the server to see if there's anything odd on there.

At the very least, just try "nslookup grcpdc1.grnriver.local" - it might tell you a bit more about why it's not able to locate the server.