"My Sites" links for editing the other sites fail (The webpage has a redirect loop.)

1- the "My Sites" link on the upper left portion beside the Wp-logo, fails except for the main site. When I click on them, the page will display: The webpage has a redirect loop.

2- Also, how do I add links to that portion ("My Sites") on the upper left part. I created a new site but it did not show up there. Is there anything that I need to do before I see the links for that site there?