I had this problem with CodeKit 2 on Android but instead of using my-imac.local:5757
i used my Local IP Address and the same port http://192.1.2.3:5757
and it worked perfectly.
I am using Chrome on Android 5.0.1 which is the most recent version as of this post.
In case you're not sure how to get your IP Address then hold Alt Key and click the wifi logo in your menu bar... You should see IP: 123.45.6.7
Note Remember you must be on the same WiFi network as your computer.
Hope this helps you and/or any future people experiencing the same issue.