make-network-process timing out when connecting swank server

Mirko Vukovic mirko.vukovic at
Sun Apr 19 15:09:59 UTC 2020

I moved from spacemacs/sly/slynk to spacemacs/slime/swank - the issue

I fixed my original post to reflect this change.

On Sat, Apr 18, 2020 at 8:06 PM Mirko Vukovic <mirko.vukovic at>

> Hello,
> This is a follow-up to a thread that I started a few weeks back (What are
> port requirements for remote lisp?).
> I run Msys2's Emacs on a corporate laptop running windows 10, and I don't
> have administrator privileges. I am using Sly and Spacemacs.

I now use slime/swank on Spacemacs

> My problem is that sly-connect times out when trying to connect to the
> swank server.
> Slime-connect times out

> With Martin's help, I was able to establish a tunnel, start swank, and
> with a telnet session on the laptop verify that I can send commands to
> swank (see that other thread for details).
> Nevertheless, sly-connect still fails. Stepping through the code, I came
> to a call to make-network-process, which is a C function.
> Slime-connect times out. The low-level function making the call is

> The error message is
> "make client process failed", "Connection timed out", :name, "sly-4",
> :buffer, nil, :host, "", :service, 4005, :nowait, nil,
> :tls-parameters, nil
> I need help in figuring out the cause of the problem so that I can ask our
> IT department for specific help.
> My emacs can connect to the internet - for instance, org-ref
> (orgmode+bibtex) can fetch journal article citations using DOI's.
> So, why is make-network-process failing in this instance?
> I am looking for some simple tests of make-network proces that can narrow
> down the cause of failure when connecting to swank.
> I was going to ask on the emacs mailing list, but I thought it best to
> start here first.
> Thank you,
> Mirko
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