We’ve got a custom application that needs to serve requests on it’s own port number. We really don’t care what the number is, although we’ll stick to that port after we decide. How do I select a number which is least likely to conflict with other applications or services that are running on the user’s system?
Are there any rules or standards we should follow?
A clarification: once we pick a port, we need to stick with it. Can’t use a dynamic one. We’re building a custom SFTP server and we’ll have to tell our customers what port it’s running on.
If you can’t predict the exact kind of environment your application is going to run, just don’t bother with this. Pick any number over 1024 and also make it configurable so the user can change it in case of conflict with another service/application.
Of course you can still avoid very common ports like 8080 (alternative HTTP) or 3128 (proxies like squid), 1666 (perforce), etc. You can check a comprehensive list of known ports here, or take a look at /etc/services.