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Ports appear to be blocked when using Proxy server for broadband

Posted on 2006-11-11
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Last Modified: 2010-03-18
Hello!

My situation is this.  I currently have two ways to access the internet.

The first way is good old fashioned dial up via a 56Kb modem to an ISP.

In this method I supply a userid and password, but no Proxy address on the connection.

This method allows me to browse normally, and also use client based applications.  Examples are:

1.  Outlook Express for hotmail access
2.  SilentSurf Pro which allows to bypass blocked sites
3.  Wagerstreet - a client based online gambling application
4.  A brand new online video game - this works but (of course!) very slowly.

My second method of accessing the internet is via a DSL connection. However this connection forces me to use proxy server addresses for HTTP, Secure, FTP and Socks. All of these are the same IP address using Port 8080.

The connection speed is ok and normal browsing is fine.

However when I try to use the above client based apps (that work ok on dialup) I get a timeout message.

The best example is the Outlook Express with a Hotmail Account.  Works ok on dialup but the broadband I get:


This service does not currently work with Outlook Express

Details:
Configuration:
   Account: Hotmail
   Server: http://services.msn.com/svcs/hotmail/httpmail.asp
   User name: myaddress@hotmail.com
   Protocol: HTTPMail
   Port: 0
   Secure(SSL): 0
   Code: 80042007

I get similar but more generic messages with the other clients basically timing out.

It is possible that the proxy server is blocking ports like 22,23, 25 etc?  If so, is there a way to check a proxy to see what ports are blocked?



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Question by:Varrus
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by:Keith Alabaster
ID: 17922847
Yes, its quite possible. Is the default gateway of the clients also pointing to the nic on the proxy server?

What is the proxy that is being used? ISA server?
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Author Comment

by:Varrus
ID: 17924351
Thanks for the reply Keith!

I am not sure how to check the default gateways of the game and Wagerstreet, however the Outlook Express indicates that it is using the same settings as Internet Explorer.  I also modified the Hotmail account in Outlook to use the LAN settings to be sure, so it should be using the same gateway as the browser.

The proxy is simply an IP address.  In this case 10.1.1.2 which is basically connecting to a local machine on my local LAN that is the proxy.  I presume it is a Windows 2000 to 2003 server but not sure.  
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Expert Comment

by:Keith Alabaster
ID: 17924442
<I am not sure how to check the default gateways of the game and Wagerstreet>
Open up a cmd prompt on each pc and type in ipconfig /all. The default gateways will be shown. Does this match the ip of the Proxy server?

Are you the administrator of the Proxy service? Windows does not provide a proxy service per se in standard Windows server so there must be abother product in use here.

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Author Comment

by:Varrus
ID: 17924743
Keith:

No I am not the administrator.  There is another party handling the equipment and the setup.

I mainly want to gather some information to concretely prove that it a problem with the Proxy server setup and nothing on my side.

Is there a way to see what ports a Proxy Server is blocking from my side or does it need to be looked at from the Proxy Side only?  

If I am looking at the Proxy side, what is a quick way to determine what they are blocking?
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Accepted Solution

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Keith Alabaster earned 500 total points
ID: 17925505
You could, for example, try a telnet session on the respective ports.

from a cmd prompt.

telnet ip_address port number   telent 1.2.3.4 25  would test the smtp port

If you get a connection refused ot cannot connect message then its blocked or not allowed. If you get a hanging screen with a flashing cursor then the port is likely open and operative.
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by:Keith Alabaster
ID: 19365676
Thank you :)
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