Storage Replica relies on SMB and WSMAN for its replication and management, meaning the following ports are required:
445 (SMB - replication transport protocol, cluster RPC management protocol)
5445 (iWARP SMB - only needed when using iWARP RDMA networking)
5985 (WSManHTTP - Management protocol for WMI/CIM/PowerShell)
Note
The Test-SRTopology cmdlet requires ICMPv4/ICMPv6, but not for replication or management.