I had this issue and resolved it by modifying the varien.php file. Its however returned again and I can not login to admin.
I am on working locally on windows with XAMPP and version EE 1.10
I’ve tried the following
web/unsecure/base_url = http://www.localhost.com/tco-trunk/
I have modified the varien file so that $cookieParam[’domain’] = localhost.com (this worked before)
Is there a simple way without hacking the code to disable admin login altogether on my local machine? This issue is really frustrating!