no me cargar el nether, me meto al portal y se me queda trabado en la pantalla de cargando terreno
[Texture Downloader #7/ERROR]: Couldn't download http texture: java.net.UnknownHostException

Could you write the description in English and add more information - surrounding log lines, using mods/optifine and their version, Minecraft and fabric-loader version?
I'm not sure that this is an optifabric problem.

A full log or mod list is definitely needed to be able to debug this further