At this point it seems it doesn't even see the app:
Server Error in '/' Application.
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
The only place I found a trace of the old domain was in the db.config file (as you suggested), changed it to the new URL but no luck. At some point I was able to get a message 'turn off custom messages in web.config' but did not find this file either. The only thing I still see on webhosting under installed apps: Yetanotherforum: Admin URL: 'http://oldDomain/yetanotherforum/' -- where 'oldDomain' is the previous domain. Maybe this path also needs to be changed, but of course they don't give you that option. Maybe I can uninstall this version and reinstall the new one? Would the database be also wiped with a reinstall or can I keep the database with tables, users and topics?
We're still on 1.9.4 at this point, planning to upgrade to the latest once I can get it working on the new site.
Thanks!
Blade~