Hi,
Just now works again ... I don't and I don't know why.
Simply a guess, but 000webhost at least today, did they have troubles with connectivity ? I didn't make any change ...
Regards
NOTE: I have two installations one with 2.4.1 and other 3.0 and both works fine now... I don't know for how time.
PD: Some free hosting have restrictions, for example someones add a piece of code inside ajax response, other cannot load files named cookie.js, .... and a long ecetera.