Catch exceptions in CanConnect and return false #18867
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Fixes #18355
We can consider logging the exceptions, although I'm not sure that would be the right thing to do - this method is purely about checking whether we can connect or not, and it could be said there's no actual "failing operation" warranting a log message. It would also likely cause lots of spurious log messages as automated health checks fail while networking is down etc.
Note that I don't think this is a breaking change, as applications are already expected to check for false.