I use OSC7 directory tracking with (add-hook 'comint-output-filter-functions #'comint-osc-process-output) This works when I am on my home wifi, or with wifi turned off, or when tethered to my phone. It does *not* work when (I think) reverse-DNS lookup assigns my machine someone else's old name. My directory tracking OSCX7 output looks like this: file://ebenezer2023.local/Users/bem The hostname is always the same. (Right now, it's hardcoded.) In the working situations, the bash `$HOSTNAME` is `ebenezer2023.local`. `scutil --get ComputerName` returns `ebenezer2023`. (These are all correct.) But in this one particular location, with their particular wifi setup, if I create a shell buffer, the hostname is (I'm guessing) from some leftover IP address. At this moment $HOSTNAME is `DESKTOP-TEBA9J7`. `scutil` produces the same correct output (`ebenezer2023`) as before, but it doesn't matter. Directory tracking stops working. My hunch is that the OS is being told about a `file:` on `ebenezer2023.local`, says "I am `DESKTOP-TEBA9J7`. I know nothing of this 'ebenezer'. Therefore, I shall fail.” This is clearly (to me) a problem with MacOSX. However, I haven't been able to find a workaround. (For example, I'd hoped that somehow, magically, starting a shell with wifi off, then it would work with wifi on, but no.) I don't know if there's anything you can do, or if you can supply any workaround. Note: I've tried leaving the hostname empty (`file:///Users...`) and putting `localhost` in it, but no joy. I also described this in `https://emacs.stackexchange.com/questions/80343/comint-osc-process-output-directory-tracking-does-not-seem-to-allow-an-empty-hos` which got this response, which may be helpful: "Arguably it is a bug. The function ansi-osc-directory-tracker in Emacs expects the host part of the url to be nil if it was left unspecified, but the function which actually parses urls (url-generic-parse-url) sets it to the empty string instead. It does set the port to nil if it is an empty string, but it doesn’t do that for the host. "Which one is wrong? It is hard to say. But you could use M-x report-emacs-bug to send an email to the developers with that information and let them hash it out. In the mean time fixing your prompt as you have done is the right thing to do.” [The last sentence was before I realized my fix didn’t actually fix the problem.) 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