I myself developing TeaClient a Minecraft Modpack/Client whatever you like say, I experience this issue myself while developing, note this is unaffiliated with mojang. There indeed is Issues with skin and connecting servers, I am actively keeping my users updated.
However it does effect those under <1.16.5 with connection issues and some later versions with skins on later versions. From reading this is the issue with java version that your using that doesn’t accept the new certificates (TLS) so easy fix is use a later version of java that supports the new certificates or use curseforge/minecraft launcher.
eveeifyeve
I myself developing TeaClient a Minecraft Modpack/Client whatever you like say, I experience this issue myself while developing, note this is unaffiliated with mojang. There indeed is Issues with skin and connecting servers, I am actively keeping my users updated.
However it does effect those under <1.16.5 with connection issues and some later versions with skins on later versions. From reading this is the issue with java version that your using that doesn’t accept the new certificates (TLS) so easy fix is use a later version of java that supports the new certificates or use curseforge/minecraft launcher.