Services - FAQ
Two types of TCP port are used: static ports and dynamic ports.
- Static Ports
Several services used by the software listen for incoming network traffic on predefined network ports. The CommServe system, MediaAgents, and iDataAgents within the CommCell group communicate with each other through these ports. Essential CommServe services are automatically assigned registered, static port numbers during installation. MediaAgents, iDataAgents, and other software components can use the same default static port numbers, or any static port numbers specified during installation.
Default Static Ports
The software registers these static ports by default, for the services listed:
Service Port Number Protocol NetApp Communications Service (GxCVD, found in all CommCell computers) 8400 TCP NetApp Server Event Manager (GxEvMgrS, available in CommServe) 8401 TCP NetApp Client Event Manager (GxEvMgrC, found in all CommCell computers.) 8402 TCP
- Dynamic Ports
Dynamic ports are opened and closed by the running SnapProtect software as required to permit certain types of transient traffic.
The GxCVD service dynamically uses free ports between 1024 and 65535 for communication during data protection and data recovery jobs. The system dynamically assigns a number of free ports to be used by each job to allow parallel data movement. Once the job is finished, if no other job is pending, the dynamic ports are released.
Network TCP port requirements remain the same whether the IPv4 or IPv6 protocol family is used. Dynamic port range assignment can be restricted by using Binding Services to Open Ports.
For instructions on stopping and starting services on a Windows Core installation, go to the Microsoft TechNet website. Search for the article Administering a Server Core installation, open it, and look under the section Services, processes and performance.