I have just upgraded a site I am developing to version 2.3 FROM 2.13 following the instructions, I have backed up files, deleted the old version and uploaded the new files without a problem.
However when I attempt to access my wp-admin/upgrade.php and finish the upgrade I get the following:
Too many redirects occurred trying to open “http://myurl/wp-admin/upgrade.php?_wp_http_referer=%2Fwp-admin%2Fupgrade.php%
... which repeats
"This might occur if you open a page that is redirected to open another page which then is redirected to open the original page."
There is only one instance of upgrade.php uploaded and I can successfully open the file locally.
Any ideas please?