Since few days (as my players noticed) ago ChangeSkin stopped to download new skins.
Spigot 1.12.2 / ChangeSkin 2.4.2
No errors in console.

Steps:

• /skin i0xHeX (chat sends that all is okay and I need to rejoin)
• Rejoining
• No skin applied (however works with latest SkinsRestorer 13.3)

Tried:

• Remove local database and restart server

Configuration: https://hastebin.com/faxojujidi.vbs
It seems something changed on mojang api, as I know - rate limit became strongest.

Please try with the latest build from the Jenkins instance.

Nice, b52 works now.