No permission to open socket or another server is already running on null:8083: Address already in use: NET_Bind

Hi Community! I am facing the issue that I cannot run my app locally, also in Eclipse. I changed the port to 8081, 8082, 8083 and all of them were not working fine.   I am also sure all of these ports probably are not listened.   So I am confused if I really don’t have the permissions to open these ports (because my laptop is probably configured with permission restriction)? Thanks a lot.
1 answers

Adding this so it's more visible for future users. Kevin solved the problem himself:

The problem was solved by rebooting the machine, so that should be a first step in trying to fix this issue.