invalid login or password Mcrypt error

Question

I\' facing an issue with registered Customer through checkout.

After the checkout process, the customer lands in “My Account” but once logged off, he can’t acces \"

Answer 1

Got it!

The encryption field was empty in app/etc/local.xml

<crypt>
    <key><![CDATA[]]></key>
</crypt>

So, placed the encryption key of the fresh installation I did in my subfolder and it solved the issue.

<crypt>
    <key><![CDATA[encryption_key]]></key>
</crypt>

I don't know what happened during the first installation of Magento on my server, I've double checked in my backups and there's nothing here from the beginning.

I hope nothing else has failed during installation, any suggestion of files generated during installation I should look at?