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Online Failover Agent unable to acquire VIP

Affected versions

  • Main release versions from DataMiner 10.3.0 [CU20]/10.4.0 [CU8] up to 10.4.0 [CU11]
  • Feature release versions from DataMiner 10.4.11 up to 10.5.2.

Cause

In certain Failover configurations, especially those with more than the usual 2 VIP addresses or multiple NICS, the online Agent may fail to acquire a VIP, getting stuck in the "Acquiring Virtual IP Address xxx.xxx.xxx.xxx" state (in FailoverStatus.txt). This makes it impossible for users to log in to the DMA.

Fix

Install DataMiner 10.4.0 [CU12], 10.5.0 [CU0], or 10.5.3.

Description

Users are unable to log in to a DMA in a Failover setup.

The SLFailover logging contains multiple instances of messages similar to the following:

2025/06/04 13:38:36.310|SLNet.exe|Legacy_DoSwitch_WaitForVIP|INF|0|33|NOT switching state: Cannot claim DataMiner Failover IP 192.168.185.4/10.0.8.89/10.0.21.120 (still reachable; not local)
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