ok,
you probably have a mistake in your config.php file. Most likely $CFG->wwwroot is wrong. Check it carefully and/or post the whole file here (without your passwords please!!).
Also check that you don't have any strange redirects setup in you httpd.conf or you .htaccess files.
Installing and upgrading help
Email server name- I didn't add it!
This discussion has been locked so you can no longer reply to it.