Port Problems & Webpages

[Wiggz]

Guys,

Warwickshire, Nuneaton area seems to be having problems accessing some national and international webpages (which can be access through other connections) and also some ports, 21, 81 and a couple of others also not connecting.
Anyone know of any probs

Wiggz

[Chris W]

the webpage problems may be due to a proxy server problem; have you tried specifying a different one?

Also what has lead you to believe that there are problems with some port numbers...??

[John Doe]

Any packet loss?

What sort of problems are you having on port 21 and 81?

[Wiggz]

Firstly, Thanks for your prompt replies.

Actually I am not sure it is a port problem. I sometimes can access our companies FTP server on port 21, and sometimes not, but there is definately nothing wrong their end which is why I thought there would be problems.

Strange. Haven't tried a different proxy. Where best to get a list of good ones? Robin's page?

Wiggz

[John Doe]

Set a proxy (IE) (http://homepage.ntlworld.com/robin.d.h.walker/cmtips/trancache.html#iew)
Find a proxy (http://homepage.ntlworld.com/robin.d.h.walker/cmtips/trancache.html#iew)(nearest to you is best, then work away. Try a few)

Use tracert (http://support.microsoft.com/default.aspx?scid=kb;EN-US;162326) to ensure there is no packet loss/routing problems.

Pathping (http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/pathping.mspx) (MS 2000 and above) to do big ping tests.

[Chris W]

Robin walkers page is a good source of proxy list.

This will not affect ftp traffic though, so that seems to be a different issue.

[Wiggz]

Thats what I thought Monkey. I tried a couple of old proxies I had....now tried the new ones on Robin's page and none change the Web issues. But as you state the ftp issues seems to be seperate

Wggz

[John Doe]

This will not affect ftp traffic though, so that seems to be a different issue.
Try both passive and active (http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci512897,00.html) methods for FTP, that might help or a different client. I use FTP Surfer (http://www.whispertech.com/surfer/index.htm), and recommend it.

[Wiggz]

John,

thx for the reply. This is not the issue. It doesn not even get to a dir listing, it simply halts at the connection stage which is a simple handshaking. PASV doesn't hamper that

[BBKing]

Try another FTP server for comparative purposes.
Also try pinging the company server to check for packet loss. If pings are blocked, try a traceroute to see if there's any loss en-route.

[Paul]

Robin walkers page is a good source of proxy list.

Try looking a little closer to home, they are listed in the Knowledgebase. :D

http://www.cableforum.co.uk/kb/47/list-of-ntl-proxy-servers