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Accessing a Server From behind firewall

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by osamahamzah

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I work in a university where they have NT domain and An internet connection with Bandwith of 4mbit, but no one can access the internet at faster than 10 kbit/sec!!!!

i have an adsl connection at my home and i can access my home PC ftp's server and dl/ul at 40k/sec from inside the same university lan!!!.

So i installed a Proxy server at my homes PC and i wanted to access that server at home from my office at work, so i can access the internet through that prosy server at 40k/s!!!.

Now they have a firewall here in which allows the Ports 21,23 and 80 only , so i configured the proxy server to use port 21 at home, but for some reason i cannot access it from work still!!

I am doubting that the Ie5 which i am using , is not using theport 21 to initiate the Connection , i mean if the connection like this :

Workpc:21 <------> Homepc:21

then it should work , but i think it is something like this:

WorkPC:?? <----> homePC:21

so is there any way to change the port which IE5 uses , or is there any other solution!!!
Thanx for Reading.

2 replies

by william shipway

I have a couple of comments but perhaps no solution. I like your idea but I think it is doomed to fail sorry!

It sounds like your Uni internet connection has some bandwidth control in place at the firewall or a border router. This would explainthe 10k/s for HTTP and 40k/s for FTP. Have you tried FTP to other sites to see if you also get 40k/s there? Also, have you tried HTTP to your home PC? I think you will find that HTTP to your home PC only comes through at 10k/s, and if so, a proxythere is of no use at all.

Have you tried surfing when there is no-one at Uni, late at night perhaps? Does the HTTP speed change then or is it always 10k/s? If it is faster at night then perhaps the firewall is overloaded - if so then your proxy idea is probably not going to help.

You may also find that the Uni firewall only allows FTP on port 21, and not HTTP. This depends on the firewall though. The error message in ie5 should tell you what is happening.

If you have configured ie5 proxy as your home PC on port 21, then you should have no trouble through the firewall (unless it only allows FTP). Are you sure the proxy is working on port 21? I expect you would have had to stop the FTP server to do this - if not it probably won't work. You can test this using a browser at home and configuring it for the proxy.

I assume you have allowed connections from the Uni's external internet address(es) to your proxy server. If not the connection will be refused.

You also need to consider security. I hope you don't have anything important on the home PC that is the proxy. Have a look at http://www.sans.org/ for example.

HTH
William

by osamahamzah

thanx for replying so fast , but i hate when my idea is going to fail any ways :(.

the ftp and http bandwidth from inside the university is getting from 10-16 k/s , and the proxy server is working on port 21 at my homes pc, i used a port scanner to scan my pc from outside it responded correct.

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