Since we live in a completely deterministic universe, something has surely changed.

The OP doesn't mention whether the remote server was validated. Maybe it is no longer at 10.0.0.1. Maybe the server has been updated due to some enormous flaw in a widely used library. Maybe the server has a new certificate and there are trust issues. When looking for what has changed, remember that it may not be something you did.

NB: I find it handy to leave comments in my code on how to test external resources (usually needed during development anyway). I prefer commands I can use from a shell prompt as they tend to be more stable over time (IMO).