PureBasic Forums - English

Here's a scenario: I'm browsing web pages on the internet when I come across something that looks interesting to download. I click the link, the download starts and I get my file. My question is, did the browser open another port for the download or did it come in on port 80 like my webpage? The reason I ask is that I'm experiencing stability issues with my broadband connection. From time to time I will lose connectivity and be unable to load web pages for a couple of minutes. Windows network diagnostics will say the broadband modem is experiencing connectivity issues and recommend a reset. But all the while I can't load pages, if I have a download coming down, it seems to churn along unhindered. This happens on multiple computers, with both wired and wireless connections to the router. Quite mystifying, to me and to the 3 different cable techs who've visited. Any thoughts on the subject would be most welcome.

netmaestro wrote: My question is, did the browser open another port for the download or did it come in on port 80 like my webpage?

Every item on a web page is download using a different connection. They will usually all use port 80 on the web server end but your PC uses (usually) consecutive high numbered ports on it's end. Each connection is defined by the IP address and port number for each end.

The problem you are describing can occur if you are having problems with DNS.
I would usually try setting my DNS to OpenDNS or Google.

A program such as WireShark can be useful to see what is going on.

Jim

When you download something, most likely a new connection on port 80 will be established.
Try deleting all caches, as well as DNS tables and ARP tables.

*edit: little too late*

Also Procmon in the proprties tab of your selected browser, select TCP/IP tab and you can see which ports and protocols used as a file is download, with browser and procmon in half/half screen view

Zebuddi.

Each download creates a new socket. It usually maps to port 80 as destination and a sequential available (not used) port as source. This way each connection is unique and separate from each other.

If your happens with more than one pc, the problem most likely isn't in your pcs or it's configurations.

The problem either rely on the broadband router's hardware or it's configuration (most likely), or the provider's backbone infraestructure (doubtful - unless it's a DNS server problem - that's more usual).

Can't you test another router to troubleshoot?

I started with one modem/router combination device, an Arris Touchstone SBG6782. The first tech who came out replaced it with a new identical model. The third tech replaced that with a Cisco DPC3825. No noticeable effect at all to changing hardware.

computers are complicated

I get this same problem about once a year - call our service provider, they say nothing wrong their end, then within 48hrs the issue miraculously disappears........