By default, when you set up a redirect experiment, Optimizely blocks other redirects for 5 seconds so that you don't cause an infinite loop of redirects.

For example, this might happen if you set a redirect test from www.example.com/original to www.example.com/redirect and you have set URL Targeting to a substring match for www.example.com. 

Because both the original and redirect page meet the targeting conditions, you will trigger an infinite redirect loop.

If you do not wish to have the 5 second check that blocks additional redirects for 5 seconds and are absolutely sure that your URL Targeting does not include any matches for the site being redirected, then you can unblock additional redirects by following the below instructions.

In Optimizely, you can unblock additional redirects by checking the "Allow Additional Redirect" box in the Redirect settings sidebar.