Recently, my locally developed web service has been experiencing intermittent connectivity issues with Port 8080. Initially, I couldn't access the service and would have to refresh multiple times before it became available. Upon further investigation, I discovered that the issue was caused by Tencent's QQ software occupying the port. The strange thing is that the port is released when I close QQ and reopens with a new connection IP. The IP is always from Jiangsu, Nanjing. I'm using the latest version of QQ (6.9.51-26339) and MacOS (14.2.1 (23C71)). I'm curious if anyone else has experienced this issue. What can I do to prevent QQ from occupying the port, or at least inspect which service is using it? Additionally, is it possible to change the web service's port to a different one, as it's quite inconvenient.