I have solved the problem for me anyway.
I am not an expert and do not know if this is bad to do…I only know that it worked for me…do it at your own risk.
1and1 appears to have the file wp-admin.php on an 301 redirect.
DO THIS: download via FTP “wp-admin.php” and rename it to something different (like wp-admin22.php)then modify the files contents by searching for and changing all references in that file from “wp-admin.php” to the new mame of the file. re-uload it to your root of WP and hit that file with your browser and I think you will have access…..I did!!
FOLLOWUP:
I have found that after logging in with this method, so long as you do not log out…you have access to your control panel by just going to the sites regular url. Another words you can delete the file you uploaded.
