Network Unextension stuck at 15%, 'Configuration received <Network name>, Disconnecting vnics on remote side.'

Products

• VMware HCX

Issue/Introduction

• From HCX UI, when a network un-extension is triggered, task stuck at 15%.
• Error status: 'Configuration received <Network name>, Disconnecting vnics on remote side'.
• From cloud end the task is already in 'Failed' status.
  
  

Environment

VMware HCX

Cause

While initiating a network un-extension task from HCX, the backend real-time site pairing connectivity is validated.
If incase the "site pairing is in disconnected/down" status, the behavior is expected.

Resolution

1. Fix site pairing connectivity, which should resume the un-extension task.
2. If one site is with failed state, and other site task is stuck, a Force unextend option can be triggered which will forcefully initiate a "un-extension" task irrespective of validating the site pairing at the backend.
   
   Note: Do not initiate multiple un-extension task, this may lead to a stale job queue behavior.

Additional Information

Log reference related to site pairing can be validated in below paths from HCX manager:

/common/logs/admin/app.log
/common/logs/admin/web.log

web.log explains "ConnectionTimeout" exception:

2025-12-06 01:29:48.932 UTC [https-jsse-nio-127.0.0.1-8443-exec-4, Ent: HybridityAdmin, , TxId: TxId: 8f3#####-663c-####-####-488e########] ERROR c.v.v.h.api.registration.CloudConfig- Login to https://hcx.#########.########. Reason:  ConnectTimeoutException

Note: Below log lines are only for reference, timestamp and the connection failure reason may vary.