[JENKINS-58806] Root exception is java.net.UnknownHostException

I'm trying to integrate jenkins with Active Directory. but getting  "Root exception is java.net.UnknownHostException" error.

 

Jenkins is running in docker container on swarm cluster.

---
Originally reported by pbogapur, imported from: Root exception is java.net.UnknownHostException

• assignee: fbelzunc
  
• status: Open
  
• priority: Blocker
  
• component(s): active-directory-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 1
  
• imported: 2025-12-07
  

Raw content of original issue

I'm trying to integrate jenkins with Active Directory. but getting  "Root exception is java.net.UnknownHostException" error.


 


Jenkins is running in docker container on swarm cluster.

environment

```
Jenkins Version: 2.176.2

AD Plugin Version: 2.16
```

1 attachment

- [error_log.txt](https://issues.jenkins.io/secure/attachment/48179/error_log.txt)

The issue names no repository files, tests, or entry points. Start by reading error_log.txt and checking the reported Jenkins 2.176.2, Active Directory plugin 2.16, and Docker Swarm environment; done requires a reproducible diagnosis and a confirmed plugin or configuration fix.

Written by the indexing model from the issue text.