Use this node list and add it to your client: https://espstats.net/nodes/
Either via the debug console ('addnode
or via Espers.conf in the data directory (just add the 'addnode...' lines to the file and restart the wallet).
The exchange wallet will go offline if they didn't update their wallet in time. They will need to fix that and join the network by installing the update, and maybe resync the chain, which could take some time. Monoxide contacted exchanges and told them to update, maybe he could list the "good" exchanges that updated their wallet here.