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ADSL transfer failure for large HTTP files

Posted on 2009-05-20
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Last Modified: 2013-12-14
We're currently suffering from a rather odd problem that appears to be our ADSL line...

The ADSL connection is being used to host web services (HTTPS/443). When connecting externally, small data transfers seem to work fine, however larger data transfers hang.

For example:  

* Accessing Outlook Webmail, the browsing of folders and messages works fine, however as soon an attachment is attempted to be downloaded, the transfer hangs.

* Windows server (IIS) file web sharing - the directory tree can be browsed, however attempting to download a file from the system causes the transfer to hang.

Naturally, we suspected IIS, however we also have a SVN server running on Apache (different port, not a standard HTTP/HTTPS port number but still using SSL). Again, browsing the repository works fine however attempting to download a file causes the transfer to hang.

To narrow down the fault, we installed a brand new instance of Apache onto a clean laptop. Connected this laptop directly to the ADSL modem, bypassing all firewalls and network switches. Again, the access of a basic Apache page works (the "It Works!" default page), however we placed a file into the appropriate directory and attempted to download it and, again, the transfer hangs.

We replaced the ADSL modem with another (entirely different make/model) and repeated the basic test with just the laptop running Apache and, again, the transfer hung as soon as we attempted to download a file.

We have contacted our ISP (BT), and they performed a line check and everything is apparently fine.

Any ideas what the problem is likely to be and/or how we can further diagnose this problem?
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Question by:NickRyan
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djpazza earned 500 total points
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One of my clients had this issue this morning.  BT are moving a lot of business customers with static ip's to new servers.  During this period large transfers will suffer.  They estimate an email with 6mb attachment could take an hour.

I would give them a call for an update.


for more information see here:

http://business.bt.com/business/help/ss/0,8829,Broadband_0_5_BTCTB_Home,00.html
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by:NickRyan
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Thanks djpazza - seems that the BT support engineers we spoke with earlier were clueless and the BT status page carefully neglected to show this issue.

It's been happening since 10am on Monday morning, with no expected resolution time. Still not on their status page.
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