VCS services do not start on systems where SEP 12.1 or later is installed

Last published : Oct 01, 2026
The following issues may occur if you install and configure VCS on systems where Symantec EndPoint Protection (SEP) 12.1 or a later version is installed.
  1. In an IPv6 environment, the High Availability Engine (HAD) service may fail to start. (2439737, 2487369)
The following error may be displayed:
Failed to start the cluster. Error=FFFFFFFF.
Failed to start services on all the nodes.
  1. If you set up Disaster Recovery using the Global Cluster Option (GCO) in an IPv6 environment, the status of the remote cluster (cluster at the secondary site) shows as "initing".
Workaround: Configure the SEP Firewall policy to allow IPv6 traffic on the cluster nodes.
Edit the Firewall Rules table and enable the following settings:
  1. Block IPv6: Set the Action to "Allow"
  2. Block IPv6 over IPv4 (Teredo): Set the Action to "Allow"
  3. Block IPv6 over IPv4 (ISATAP): Set the Action to "Allow"
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