Comments - Strange ssl messages in error log
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This could be a problem with your network setup you might have blocked traffic from the US-east servers to the west, however not the other way, I know it sounds silly, however it is possible to ping from one server to another and not the other way around this is to do with how your security groups are setup on your network connections. I am not sure if Gallera will cope with that being the case however its a good place to start and eliminate.
Can you access any db server as a mysql user from any other server?