On your test site make sure your /core/install/ folder is still in place, upload tools.php to the /core/install/ folder, browse to your test site /core/install/tools.php file and reset cookie domain, cookie path, verify the forum path is correct (for your test site), clear the options cache, and then rename the /install/ folder to something like /install-test/ (or anything other than /install/) and try to login to your main forum again, and then once you have logged into the forum, login to the Admin CP.
tools.php of course comes from the do_not_upload folder in the original install .zip package.
tools.php of course comes from the do_not_upload folder in the original install .zip package.
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