After upgrading none of my portals will load. They all say Domain Name XXX Does Not Exist In The Database  I checked the Portals and PortalAlias tables and the data is still there. Any ideas before I restore and retry?

I have the same complaint about upgrades. It seems that no matter what I do, the last several upgrades managed to break all portals on the server. I follow the upgrade instructions to the letter, but it does not seem to matter.

The last couple of upgrades I was able to get working by simply restoring the old web.config file overtop the upgrade web.config. Consequently, I have a fairly recent version of dnn, running with an ancient web.config file. I suspect this will come back to bite me at some point, but so far it's been an acceptable workaround. I have held off the latest upgrade, hoping I can find out if I am digging my grave with this strategy or perhaps there will be a comprehensive answer at some point.

If anyone knows the nitty-gritty of what to do with the web.config during upgrades, I'd sure like to see it. Copying the keys and the sql connection strings over does not work for me.

I managed to fix the problem by using my old web.config file as well.

Yes, it's probably a dumb thing to do, but it works, and if the documentation doesn't tell us EVERYTHING we need to copy from the old web.config to the new one it's very difficult to troubleshoot.

I followed the upgrade instructions each time, (copying SQL strings, keys etc) over to the new file, but despite this it didnt work.

FYI the upgrade on the db ran flawlessly, no errors reported.  However trying to browse to the portal site after the upgrade completed reulted in the OP's error message.

My portal now runs fine, but using the OLD web.config file too.

I know a small amount of scripting and the web.config file is beyond my abilities to troubleshoot where the error might be.

Clearer comments in the web.config file and spacing out portions would be nice, also be nice if ALL user configurable items were kept in one chunk.

My two cents :)