Google talk was great when it came out but has been abandoned by Google. I’ve been maintaining support because I know a lot of people use it, but I myself will stop using it. I’m going to try using an account on the hot chilli server rather than run my own. I’ve been using these guys for my testing accounts for a long time. They have a fast, well maintained prosody server that supports modern specs. I recommend it. I’m going to use xmpp.monal.im only for testing (this is why s2s connections will fail going forward). Push.monal.im will be the push server and s2s will continue to work.
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