Inability to reach one website on 4 different browsers

There is a problem reaching one particular website from a private network.
The issue is with www.piaad2.org.
No client using any Windows OS Win XP SP3, Vista, Windows 7, Server 2003, Server 2008, using any browser( IE (7 and 8), Chrome, Firefox or Safari is able to reach this website.
All machines on this network are behind both a Cisco ASA 5505 and a Cisco 1841, which in turn is using a Comcast modem as a gateway.

Take ANY of these machines as is, attach it to a separate private network behind a different Comcast modem with a different external ip in a nearly identical setup, (ASA5505, 1841 router) and they are able to reach the website. The website is available  anywhere else in the world, so an error in the website seems unlikely. The webmaster for the site says the external IP the private network is behind is not being blocked by their and confirms the website is not experiencing problems elsewhere.

The errors from each browser are below.

IE (both 7 and 8)
Internet Explorer cannot read this webpage format
 HTTP 406  
   What you can try:
     Go back to the previous page.
      More information
This error (HTTP 406 Not Acceptable) means that Internet Explorer was able to receive information from the website you visited, but the information was not in a format that Internet Explorer can display.
For more information about HTTP errors, see Help.

Firefox Error
Not Acceptable
An appropriate representation of the requested resource / could not be found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Chrome
Not Acceptable
An appropriate representation of the requested resource / could not be found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Safari
Not Acceptable
An appropriate representation of the requested resource / could not be found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
406 Not Acceptable
http://piaad2.org
jsvarga88Asked:
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Fred MarshallPrincipalCommented:
Two things:

This sort of problem can be caused by the MTU being set to an unfortunate value.  Usually it's on the computer itself but might be on the router/gateway.  Saw this recently on a new HP computer with MTU of 1504.

Another cause lately has been the existence of the Ask Toolbar in IE.  But I wouldn't think it would affect all browers the same way.  

Another cause is that the router has temporarily "lost its mind".  This does happen and the results are the sort you're seeing.  Reboot the router and see if this isn't it.
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jsvarga88Author Commented:
Thanks for the esuggestion.
The MTU on the router is set to 1500.
The Ask toolbar in not on all the machines in the shop.
A reboot of the firewall failed to correct the problem.
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Fred MarshallPrincipalCommented:
What's the MTU on the computer?  I don't have to deal with this issue very often.  But it seems to me that there has to be agreement between the computers and the router.  Maybe this router is "different" in that regard?

Another cause is antivirus scanning in the router.  I've had problems with this sort of thing with similar results.  
- I've seen problems getting Microsoft and other updates that are provided via edge servers at Akamai.  The issue was our virus scan in the firewall.
- I've had problems opening Yahoo! Calendar for the same reason.
- Might you have web filtering that blocks that page?  Maybe in this ASA or other box in the chain?
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jsvarga88Author Commented:
AV scanning is not active on the firewall or router, and there is no web filtering in place.
MTO on the computer is not the issue at 1500- move it to a different network and the site is accessable.
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jsvarga88Author Commented:
No solution has been found so I am requesting this question be closed.
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