Q: Do you provide proxies on port 3128? A: No, that is the default port for many proxies servers and letting port 3128 open will reveal that the IP is a proxy on the proxy detection sites Rate answer [Total: 0 Average: 0/5] Related posts: How to set proxy in Safari Are your proxies running on port 8080? Is the port 25 open on your proxies? On which ports are running your proxies? Does the port matter?