"io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection timed out: no further information" on Java Realms

Cannot connect on Realms (Java), since 20 hours earlier.
22~23 hours ago I was playing on Realms with my friend with no problem.
But about 20 hours ago, when I was back from rest and try to connect on Realms
the message
"io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection timed out: no further information
is kept showing up.
It is still showing up, and I live in South Korea, just in case you need this info.
My friend who lives in California has the same issue.