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Maybe they need to utilize a VPN to get inside the intranet/firewall?
Taryn, I believe you may be needing to look over the following article and increase the SocketTimeOutInSeconds setting...
SocketTimeOutInSeconds setting
Hopefully this will do the trick, I suspect there is a lot of latency in the remote users' connections causing the issue, but hopefully increasing the timeout will at least allow the connection to complete, I cannot say how well the user experience is going to be after that, could be pretty poor I suspect.
Regards,
Brett