Doug,
I was wondering if you had any success in resolving this?
I have a similar problem. My site works fine (www.musicexchange.com.au – yes a work in progress need to have it running to work on it!) but then for no particular reason i get an error:
Bad Gateway
The following error occurred:
[code=DNS_HOST_NOT_FOUND] The host name was not found during the DNS lookup. Contact your system administrator if the problem is not found by retrying the URL.
Now I know that it is not the server that is down for two reasons:
-when i try from a different internet connection the site works
– I can still access the server through FTP etc.
It is a funny thing as it will often work on one computer and then not another..
Do you hava any thoughts?