Skin reset does not work

I am not able to change the skin in the launcher.
Error msg in launcher: cannot upload skin

I am not able to reset skin
Error message in laucher: Error during reset of skin

I even changed the skin in the minecraft jar file but it gets replaced with the standard one again.

If I change the skin on minecraft profile in the web it says: change successful but in the game I am still a woman.

It worked in the past but after an update of the launcher not anymore

please help