![]() You may need to reconfigure the firewall not to block any ports as source ports. But it has no impact for other newer connection types such as to CORBA and web services. ![]() Similarly, for traffic that is initiated by A.CatServer2 server, outbound traffic uses source port: ephemeral, destination port: 2809, and return traffic from A.CatServer1 server flows over the same connection. I’m just barely breaking the surface on RPC in this post. In our scenario, that person at the desk is RPC Endpoint Mapper on port 135 and they direct you to the services that are listening on the ephemeral ports. ![]() "Client Port Window" still works for connections to legacy services, such as bpcd and vnetd. traffic uses source port: ephemeral, destination port: 2809, and return traffic from A.CatServer2 server flows over the same connection. You walk up and ask the person at the desk for the information about services at the hotel, like the gym or the swimming pool. Once operating systems began using a wider range, typically 32768 or 49152 up to 65535, then newer NetBackup communication methods (like other applications) stopped applying port window constraints. Direction of TCP or UDP packets between Unified CCX server and remote device. So, the servers reply is sent from the well-known or registered port number on the server process, back to the ephemeral port number on the client machine. For example, if I ssh from my machine to a server the connection would look like: 192.168.1.102:37852 -> 192.168.1. access-list 100 deny tcp any any gt 1023. 27 In essence an ephemeral port is a random high port used to communicate with a known server port. Theyre port numbers used so that you can start a conversation and once that conversation is over, that port number. At that time the ephemeral port range was 1024 - 5000 and NetBackup made relatively few connections between hosts so it was useful to constrain NetBackup to use a more narrow range of ports through firewalls between hosts. The service for which a particular port is used by the server. The following ACL denies all TCP-based application traffic from any source to any destination where port is higher than 1023. Ephemeral ports are temporary port numbers. The Client Port Window setting was added to NetBackup and most useful when running versions 3.x/4.x/5.x. If the firewall is configured to block the outbound traffic coming from the ports without the range of Client Port Window, the backup job may fail with Status 21. Although you have defined the range of non-reserved ports for Client Port Window at Port Ranges properties, NetBackup uses port numbers outside of this range as the source port when communicating with NetBackup on another computer.
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