How to tell if a port is open/closed ?

I have a server like this: server-port: open/direct/no-wait/lines tcp://:4321 connection-port: first server-port append ports: copy [] connection-port ; client connects and disconnects... ; disconnect all foreach port ports [if port [close port]] ** Access Error: Port none not open ** Where: disconnect ** Near: close port This happens if I try to close it twice, but I was hoping the test: if port [close port] would only try to close ports for open ports. ** How do I tell if a port is open? Merci, Anton.

Hi, what about try to catch error? try [close port] -pekr- Anton wrote:

Well, that's what I'm now doing, but I thought there should be a way to see if port is open first. I tried if port? port [close port] as Tim suggested, but I get the same error. Anyway, it's resolved by catching the error. Regards,