Comment by utopiah

That's the whole point of Tailscale or just any VPN really : it doesn't matter what your ISP says, as long as you can establish a connection to the outside, the outside can connect back. Tailscale just makes that easier if you are not familiar with VPN setup.

FWIW typically ISP blocks port related to spamming, so usually they block ports related to emails, e.g. SMTP, I believe DNS too, but other ports no problem.

That being said it's quite a silly use case IMHO. If you want to work on a project from "anywhere" then put your project on your server accessible from anywhere, that's literally what servers are for and they cost the price of a coffee per month.