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I needed to create a second instance of a craft 2.0 instance and so I copied the current instance to a new instance. I followed the directions found here: https://craftcms.com/guides/duplicating-a-craft-site

The structure is like this:

/var/www/html/my_site (original - contains the craft and public folders)

copied to:

/var/www/html/new_folder/my_site (this contains the craft and public folders)

There is a reverse proxy (Apache) that handles routing of the URL's. The website comes up with no problems. But, I cannot sign into the site to administer the site. All I see is "An unknown error occurred." There is nothing in the craft.log in the instance that indicates what the unknown error is.

Is there a value in the database tables that might be incorrect? I have scanned for references to the original path and I don't find anything. The document root in the Apache config files for the instance is correct. There was a recommendation to delete the runtime folder after copying a Craft install and I have done that but I still get the error and there are no errors in the craft.log file.

One last interesting observation. When I try the admin URL for the copied site e.g. http://copy.mysite.com/admin the login page for the original site is displayed e.g http://orig.mysite.com/admin/login. So, somewhere there is a reference lurking to the old site I copied. I have changed general.php, db.php and search for references to the old host name but found nothing.

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  • Have you cleared the storage / cache from the copied instance? You may still have some cached data pointing to the original instance.
    – Campiotti
    Nov 29 '19 at 13:03
  • Check the craft/storage/runtime/logs folder for the underlying message for the "Unknown error occurred" flash. There might be something in there that helps.
    – Brad Bell
    Nov 29 '19 at 19:31
  • Cleared everything under the storage folder. What I see in the console is: Access to XMLHttpRequest at 'https://orig.mysite.com/index.php?p=admin/actions/users/login' from origin 'https://copy.mysite.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. I changed the general.php file to point to copy.mysite.com so why does the login page still reference orig.mysite.com? Where is that URL coming from?
    – Pete Helgren
    Dec 2 '19 at 19:23
  • And, also see this in logs: 2019/12/02 21:14:00 [error] [exception.Craft\HttpException.503] exception 'Craft\HttpException' in /var/www/html/copy/craft/app/etc/web/WebApp.php:972 Stack trace: #0 /var/www/html/copy/craft/app/etc/web/WebApp.php(263): Craft\WebApp->_processUpdateLogic() #1 /var/www/html/copy/craft/app/framework/base/CApplication.php(185): Craft\WebApp->processRequest() #2 /var/www/html/copy/craft/app/index.php(73): CApplication->run() #3 /var/www/html/copy/public/index.php(19): require_once('/var/www/html/c...') #4 {main} REQUEST_URI=/ ---
    – Pete Helgren
    Dec 2 '19 at 21:22
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So I am going to answer my own question here: The solution was that something, I don't know what, what messed up in the DB. So I dropped the DB and then copied it over again from the original. That fixed it. I never got an indication in the logs that the DB was the issue I just decided to start with replacing it and then work backward if necessary.

Thanks for the tips. At least it eliminated the obvious issues.

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