How do I check if a port is closed?


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I used to connect to my home PC from work, using Remote Desktop Web Connection.

The last few days I can't connect anymore... :(

I recieve an error message suggesting the remote computer doesn't accept remote connections, which isn't true.

This makes me suspect the admin here at work has closed the port Remote uses (I assume this is 3389).

Is there a way I can check to see if this port is closed?

An easy way, that doesn't require any software installations?

(And no, I don't want to ask the admin, if I did, he would be obligated to close it for sure :whistle: )

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Try going to Sygate Security Scanner or DSL Reports and use their security scanner. It will tell you what ports are open and which ones are closed. Have you tried this connection from another location? It might be something your ISP has done.

If you can get to a connection without a firewall, dialup will work fine; just use the dos command "telnet 0.0.0.0 port3389" where 0.0.0.0 is your WAN IP address. If it denies the connection, then you know it is on your end (either your ISP or your configuration).

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If that is the case and you can't find another port you can get RDC to work through properly, you might want to try Remtoe Admin. I don't remember the website but you should be able to google it. I was able to get it to work with no problems after my RDC was blocked.

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try this at the cmd prompt

telnet [ip or host name] 3389

if it conntects you will get a blank screen. Otherwise the admin blocked the port or your ISP.

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Thanks for your replies guys.

I have checked everything you mentioned, I use a DNS service, and also checked my IP at home, so that's not it.

I did the telnet [local ip] 3389 command from my workstation at work.

I recieved an error message, "connect failed". I guess that means they have blocked this port.

Tried VNC, but it didn't work...

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Ok, now I tried telnet [my home computer ip] 3389

That seemed to work...

Does that mean it is not closed?

:confused:

remote desktop connection may possibly be using more than one port...

VNC uses 2 ports 580* and 590* so it may be the same case for this...

if you can connect like you have, that port isnt closed, but like i said, you may need another port, im not sure but it could be a thing to look into.. anyway why not use VNC. you can set it up easy, and you can connect through a web browser!

peeete

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