[trevorprinn]

I'm pretty sure you are right about this being a problem with my router, but there doesn't seem to be any way of configuring it to allow the messages through. I've found that SplashId on my phone has the same problem, but they worked around it by giving the user an option to enter the IP address of the PC on the phone, and that works OK.

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Well, that is really bizarre. A minute after that last message I tried it again, on the off-chance, and it worked. I've no idea what's been changed. SplashId is working without the IP address as well.