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Remote desktop wont work after changing provider

Posted on 2008-06-22
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Last Modified: 2013-11-21
I recently changed from verizon to Comcast business as my Internet provider.  I successfully change the verizon modem to the Comcast modem and everything seemed to be working fine.  However when I try to use remote desktop connection from home to access the windows 2003 server I'm no longer able to do it as I have for the past three years.  I am able to access the server from a client computer using rdp but can no longer do it from home.  I am able to ping the server IP address from home.

Any suggestions as to why I can no longer connect to the server from home
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Question by:DrFred2004
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WallD earned 100 total points
ID: 21840641
is your router blocking TCP port 3389 that RDP uses ? or even your service providor

there are details here about changing the port you use for fdphttp://www.petri.co.il/change_terminal_server_listening_port.htm

Dont know if it will help
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by:agriesser
agriesser earned 200 total points
ID: 21840785
You should check if any ports are open on the public ip address your router @work uses. A tool to do a port scan f.ex. would be `nmap` f.ex. There are also some websites that offer online portscans.
If you tell me the IP, I can do a portscan for you, if desired.
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by:DrFred2004
ID: 21840808
is that safe to do
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by:agriesser
ID: 21840832
That depends on how much you trust the router/firewall at work.
The safest way (e.g. no other possible bad people involved) is to do the portscan on your own or ask your provider to check if port 3389 is open and forwarded to your terminal server correctly if you don't have access to the router yourself.
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by:Rob Williams
Rob Williams earned 100 total points
ID: 21840931
Was the modem changed at the business/server network or home?

If home:
-Do you connect using a VPN?  If so either the modem is a combined modem and router unit and you have another router (VPN's do not like dual routers at one end), or the service provider does not support the VPN traffic. Comcast does not support VPN's in some areas.

If work:
 -were you connecting to an IP address or domain name. That will have changed with the new modem
 -If the new modem is a combined modem and router, port forwarding of port 3389 to the next device (server or another router) will need to be reconfigured
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by:DrFred2004
ID: 21840946
I called Comcast and they needed to do something from their end to forward the port. There went four hours of my morning.  They fixed it in 10 seconds
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by:sgerling
sgerling earned 100 total points
ID: 21840953
As a side note, it's really not a good idea to use RDP over the public Internet.  Using some form of VPN tunnel is much safer.  The Cisco VPN client (if you use Cisco hardware) is a great simple solution, and the Citrix Access Gateway is a more robust option that uses a web-based login to create an SSL VPN.  There are also other options out there, but Cisco and Citrix are both popular choices for VPNs.
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by:agriesser
ID: 21840959
Good to hear that it works now for you. I figured that it must have had something todo with the port forwarding respectively the new firewall/router.
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by:Rob Williams
ID: 21840982
>>"I am able to ping the server IP address from home."
If you are not using a VPN and referring to pinging the private IP, this should be fixed as well. As a security measure routers should be set to deny ICMP requests  (pings). If not you are exposed to Denial Of Service attacks.

I assumed it was the home router. If so I would be curious as to what they did, as there is no port forwarding at that end. If the office they probably put it in bridge mode. They will not normally configure port forwarding as that requires knowledge of your private network.
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by:agriesser
agriesser earned 200 total points
ID: 21924206
Please don't forget to close this question if it has already been solved.
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