hanasaki wrote:

It used to work like a champ for me with transparent proxies too.

before

inet <-> firewall + squid transparent <-> internal

now

inet <-> firewall <-> squid <-> privocity <-> internal

Just haven't figured out how to make the "now" all transparent yet

suggestions?

I'm not sure if this has any bearing on your immediate problem, but a potential issue with Sunbird and proxies has to do with WebDAV. WebDAV (and DeltaV) add several HTTP methods (such as PROPFIND) that many proxies may not handle. We ran into this when we switched from CVS to Subversion recently. The Subersion FAQ has more information:

http://subversion.tigris.org/project_faq.html#http-methods