I've just attempted a test upgrade of DNN 4.9.5 to 5.5.1. When I went to /install/install.aspx?mode=upgrade (using the server) all it says is:

An Error has occurred. Please try again or contact a system administrator.

and it changes the path to /error.html?aspxerrorpath=/Default.aspx

Not much help. :-(  Thinking this lack of error message is due to the fix for that .NET issue last month.

Where do I go from here?

I have this in my web.config:

<!--Upgraded by Core Upgrade version 5.5.1 - Date: 9/23/2010 9:33:08 PM-->
    <!--<customErrors mode="Off" />-->
    <customErrors mode="On" redirectMode="ResponseRewrite" defaultRedirect="~/errorpage.aspx" />

Allows me to easily switch.

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The one-eyed in the land of the blind.

Thank you. I will do that.

Yet, for DavidT, the issue is how to turn customerror off so he can read the error output. And that hasn't changed.

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The one-eyed in the land of the blind.