the curious case of the inaccessible websites

I have a "business ethernet" internet connection from a TPG reseller.

Suddenly some external websites or partial websites are inaccessible 
from local clients. I haven't yet figured out a pattern, but it looks 
like javascript or some such is holding up the webpage download. The 
browser is waiting for a script or css or something not immediately 
obvious. I get the same problem with different browsers.

Some sites work perfectly - eg Westpac. The ABC site works, but after 
apparently loading it then constantly waits for something but I can't 
tell what. Some google responses work and some don't.

For example, http://www.trivago.com.au waits indefinitely for 
jse.trivago.com and never loads, although I can telnet to port 80. BTW, 
lynx works fine - which makes me more suspicious that it's CSS or some such.

I rang the help desk late on Friday. They suggested DNS (??), but I 
don't think that's it because I tried using an external DNS server and 
in any case there doesn't seem to be any resolution problem. On their 
suggestion I've rebooted both the Cisco router and NTU with no change. 
Does anybody have any thoughts?

David
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