I can't add new/update Android SDK Manager stuff. I am trying from a residence in China so no work proxy. Fine to access through a browser as you can see in the background. I tried ticking http instead of https, same effect. I tried running as administrator, same. Tried turning off firewall for 1 min to test, same. No other suggestions shown online so last resort is this.
The Android platforms you see installed in the graphic where manually downloaded and place in the appropriate folders to get them to work, but I can't find items that don't have manual download alternatives. Was fine till I upgraded to SDK tools rev. 22.