Is it possible to ping on a certain port. Or whats the easiest way to tell if a port is blocked.

[Fiveohhh]

I'm trying to RD to my home and it used to work fine, but I'm not there to check things out so. I'm wondering if theres a way to ping on a certain port for this example port 3389. its forwarded to my PC from the router, but the pc I'm on now isn't connecting. the isp just blocked port 25 yesterday so curious if they decided to block anything else

 

[AFB]

Originally posted by: Fiveohhh
I'm trying to RD to my home and it used to work fine, but I'm not there to check things out so. I'm wondering if theres a way to ping on a certain port for this example port 3389. its forwarded to my PC from the router, but the pc I'm on now isn't connecting. the isp just blocked port 25 yesterday so curious if they decided to block anything else

Goooooooogled

Ping uses ICMP which operates directly above IP, not using TCP and UDP and hence has no notion of ports.

 

[n0cmonkey]

Have something listen on the port, try to telnet to the port. If it works, nothing is blocking that port. If it doesn't work, something is blocking the port.

 

[Fiveohhh]

thanks

 

[JackMDS]

Many Cable and DSL providers are blocking ports 80 and 21, 25, 110 in order to prevent Web Servers, SPAM and email hijacking.

Other ports? I doubt, but who knows it is a Big World out there.

You are Not sure?

Make sure that the ports that you would like to check are assigned as opened through the Software Firewall and the Router on one specific computer.

Log with this specific computer to ShieldUp and ask it to scan for these specific ports.

If shield up does not report them as Opened, and you did not make a mistake than the ports are blocked by the ISP.

:sun:

 

[n0cmonkey]

135-139 are commonly blocked now too, I think.

 

[ojai00]

Did your IP change (if it's dynamic)?

 

[howdyduty]

I think there is a microsoft utility called 'portping' that can help.

 

[furie27]

Another method is to telnet to a specific port: telnet 192.168.0.1:440, or whatever. We used to use that to make sure Sun servers were allowing mail, https, or other traffic.