Unable to access Cloud Disaster Recovery Agent (CDRA) GUI. Cloud Disaster Recovery Server (CDRS) reports "No connection to Cloud DR Add-on".

Summary: This article addresses an issue where the CDRA GUI is unreachable and CDRS reports an error under the Systems --> Health tab for CDRA: "No connection to Cloud DR Add-on".

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms



This issue can occur if the Cloud Disaster Recovery Agent (CDRA) runs out of memory and swap space, causing the CDRA VM to become unresponsive.

A reboot can be performed to clear the memory. To confirm the issue, check the monitor_cdra.log for memory usage prior to reboot.

From monitor_cdra.log:

 

prcVrtMem
prcResMem
prcNumThreads
prcTime
sysSwapSize
sysSwapUsed
MemTotal
MemFree
7174865
3354992
168
Mon Feb 11 06:15:39 2019
630780
630780
3881036
86412
7174865
3355092
168
Mon Feb 11 06:15:39 2019
630780
630780
3881036
107308
NA
NA
NA
NA
630780
0
3881028
3537172
6940033
1650848
81
Thu Apr 25 19:35:55 2019
630780
0
3881028
1499704
6994245
1673680
94
Thu Apr 25 19:35:56 2019
630780
0
3881028
1399284


In the above example, (prior to the CDRA reboot) the Java process utilized 3.3 GB, swap was full, and the number of threads was 168. This confirms the out-of-memory issue causing the CDRA GUI to become unresponsive.

Cause

High Java utilization is causing the CDRA to become unresponsive and disconnect from CDRS.

Cloud DR version 18.3.0.1 has a known memory leak issue which is addressed in Cloud DR release 18.3.0.4.

Resolution

Perform the following steps to address this issue:
  1. Login to the vCenter running the on premise CDRA VM.
  2. Reboot the CDRA VM and start a ping test to confirm its availability after reboot.
  3. Login to the CDRA GUI, and go to log collection section to confirm the out-of-memory issue has been resolved.
  4. Upgrade Cloud Disaster Recovery to version 18.3.0.4 or later to fix the memory leak issue and avoid this issue from recurring. 

Affected Products

Cloud Disaster Recovery

Products

Cloud Disaster Recovery
Article Properties
Article Number: 000166301
Article Type: Solution
Last Modified: 12 Jun 2026
Version:  4
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