There are some suggestions here:<p><a href="https:&#x2F;&#x2F;github.com&#x2F;mobile-shell&#x2F;mosh&#x2F;issues&#x2F;48" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;mobile-shell&#x2F;mosh&#x2F;issues&#x2F;48</a><p>My solution to this was for the box behind NAT to join a VPN, and then connect to it via its VPN address.