Solved
Hosts file entries for gotomypc
We are using gotomypc on medical devices behind a firewall that does not allow DNS through it. We therefore rely on the hosts file (in c:\windows\system32\drivers\etc\) to resolve hostnames to IPs. ...
Just putting this here so it's searchable for others later on. I eventually got this escalated high enough up tech support to get an answer:
"If the customer is looking to configure the DSN [sic] entries directly on the host (behind NAT)
then they need to update the following entries in the system host file.
gotomypc.com 23.239.230.205
poll.gotomypc.com 23.239.230.206
gotomypc.com 173.199.10.214
poll.gotomypc.com 173.199.10.195
