An On-Premises ActiveCluster (AC) Mediator is installed on an ESXi server. The mediator was previously online but when the administrator checked the…

The FlashArrays in an ActiveCluster configuration must be able to communicate with the on-premises mediator over the network. This communication is initiated from the arrays' management ports to the mediator VM. If a firewall or network access control list (ACL) blocks the required outbound TCP port, the arrays will be unable to reach the mediator, resulting in an "unreachable" status. While the specific port is typically 443 (HTTPS), a blocked TCP port is the only plausible network-related cause among the choices provided.

A. Mediator communication occurs over the IP network (management ports), not Fibre Channel, so FC zoning is irrelevant.

B. The datastore where the mediator VM resides does not impact its network connectivity or its function as a witness device.

1. Pure Storage, "ActiveCluster On-Premises Mediator Installation and Configuration Guide," Purity 6.x. Section: "Mediator Network Requirements," states, "The FlashArray management ports must have TCP port 443 access to the Mediator VM." This confirms that network port access is the critical factor.

2. Pure Storage, "ActiveCluster Implementation Guide," Section: "Network Requirements," details the necessary IP connectivity between the arrays and the mediator, emphasizing that firewalls must be configured to allow this traffic.