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After creating VPN, sending traffic fails with java.net.UnknownHostException in AEM

Last update: Thu May 22 2025 00:00:00 GMT+0000 (Coordinated Universal Time)

This article addresses an ÃÛ¶¹ÊÓƵ Experience Manager (AEM) issue where, despite a VPN being created and showing a Ready  status, traffic through the tunnel fails with a java.net.UnknownHostException.

Description description

Environment

ÃÛ¶¹ÊÓƵ Experience Manager

Issue/Symptoms

Even though the VPN status at the program level is in Ready  state, when sending traffic through the tunnel, it fails with the error:

*ERROR* GET /bin/admin/< endpoint> HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught IOException
java.net.UnknownHostException: < host>

VPN was set-up as per instructions in the connecting AEM as a Cloud Service with your VPN documentation.

Resolution resolution

The error java.net.UnknownHostExceptiontypically occurs when Advanced Networking is not enabled at the environment level. Follow these steps to troubleshoot the issue:

  1. Check if the VPN status is Ready  at the program level.
  2. Check that  Advanced Networking  is enabled at the environment level.

Enabling Advanced Networking Configurations on Environments

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