Can't connect to ssh host with Emacs tramp

Discussion:

David Karr

2018-01-04 22:42:27 UTC

I've reviewed some of the Emacs tramp documentation, but I'm not sure
what the issue is.

If I'm using Cygwin, I don't need the putty components for this, do I?

When I attempt to open a text file in my homedir on a remote host,
which I can ssh to (passwordless) from the shell, it just times out.

The *Messages* buffer shows this (fqhn is the hostname):
------------------
Tramp: Opening connection for fqhn using scp...
Tramp: Sending command ‘exec ssh -o ControlMaster=auto -o
ControlPath='tramp.%C' -o ControlPersist=no -e none fqhn’
Tramp: Waiting for prompts from remote shell...
Timeout reached, see buffer ‘*tramp/scp fqhn*’ for details
Tramp: Waiting for prompts from remote shell...failed
Tramp: Opening connection for fqhn using scp...failed
-----------------------

There doesn't appear to be a buffer named "*tramp/scp fqhn*".

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Ken Brown

2018-01-05 01:15:29 UTC

Permalink

Post by David Karr
I've reviewed some of the Emacs tramp documentation, but I'm not sure
what the issue is.
If I'm using Cygwin, I don't need the putty components for this, do I?

No, I make ssh connections through Emacs tramp without putty.

Post by David Karr
When I attempt to open a text file in my homedir on a remote host,
which I can ssh to (passwordless) from the shell, it just times out.
------------------
Tramp: Opening connection for fqhn using scp...
Tramp: Sending command ‘exec ssh -o ControlMaster=auto -o
ControlPath='tramp.%C' -o ControlPersist=no -e none fqhn’
Tramp: Waiting for prompts from remote shell...
Timeout reached, see buffer ‘*tramp/scp fqhn*’ for details
Tramp: Waiting for prompts from remote shell...failed
Tramp: Opening connection for fqhn using scp...failed
-----------------------
There doesn't appear to be a buffer named "*tramp/scp fqhn*".

Sorry, I don't know enough about tramp to diagnose this. Maybe it would
help if you would say exactly what commands you gave. And does the
problem occur if you start with 'emacs -Q'?

Ken

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David Karr

2018-01-05 16:37:48 UTC

Permalink

Post by Ken Brown

Post by David Karr
I've reviewed some of the Emacs tramp documentation, but I'm not sure
what the issue is.
If I'm using Cygwin, I don't need the putty components for this, do I?

No, I make ssh connections through Emacs tramp without putty.

Sorry, I don't know enough about tramp to diagnose this. Maybe it would
help if you would say exactly what commands you gave. And does the problem
occur if you start with 'emacs -Q'?

What "commands" am I giving? All I'm trying to do is open a single
file on the remote host.

I'm entering "//fqhn:/home/<myuid>/.bash_profile".

I get different behavior using "emacs -Q". I don't get a timeout
error, but I also don't think it even attempted to connect to the
remote box. The editor view just opens with the given name, but it's
empty (it shouldn't be). The "*Messages*" buffer doesn't indicate
that it ever tried to make a connection. It also says "Use M-x
make-directory RET RET to create the directory and its parents".

The other frustrating issue with my full Emacs configuration is that
when I enter the second forward slash, key response vastly, and I mean
vastly, slows down. I've gone through the tramp FAQ looking for
potential performance issues, but nothing has helped.

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Ken Brown

2018-01-05 17:22:14 UTC

Permalink

Post by David Karr

Post by Ken Brown

Post by David Karr
I've reviewed some of the Emacs tramp documentation, but I'm not sure
what the issue is.
If I'm using Cygwin, I don't need the putty components for this, do I?

No, I make ssh connections through Emacs tramp without putty.

Sorry, I don't know enough about tramp to diagnose this. Maybe it would
help if you would say exactly what commands you gave. And does the problem
occur if you start with 'emacs -Q'?

What "commands" am I giving? All I'm trying to do is open a single
file on the remote host.

Yes, but I wanted to see exactly what you typed in order to specify the
remote file. Sorry if I confused you by saying "commands".

Post by David Karr
I'm entering "//fqhn:/home/<myuid>/.bash_profile".

I'm not aware of any valid Tramp syntax that starts with a double slash.
[On Cygwin, I think file names starting with a double slash refer to
network files, but I don't think this should cause Emacs to invoke
Tramp.] See the section "Remote Files" in the Emacs manual. You might
find this easier than the Tramp manual. In particular, I suggest you
try something like

/ssh:fqhn:/home/<myuid>/.bash_profile

or

/ssh:<user>@fqhn:/home/<myuid>/.bash_profile

You can omit "ssh:' in emacs-25, but this won't be allowed in emacs-26,
so you might as well get used to using it.

I'm away from home at the moment and can't easily test that I've got all
this exactly right.

Post by David Karr
I get different behavior using "emacs -Q". I don't get a timeout
error, but I also don't think it even attempted to connect to the
remote box. The editor view just opens with the given name, but it's
empty (it shouldn't be).

The file you specified with the double slash syntax doesn't exist.

Post by David Karr
The "*Messages*" buffer doesn't indicate
that it ever tried to make a connection. It also says "Use M-x
make-directory RET RET to create the directory and its parents".

So you must have some customization that's changing the behavior. You
might have to bisect your .emacs file to find it.

Ken

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George Prikhodko

2018-01-05 18:35:41 UTC

Permalink

Hi,

Have you tried to set in your ~/.emacs file ‘tramp-verbose’ variable?
If not, then add to the file the following line:

(setq tramp-verbose 6)

In '*debug tramp/scp remote_host_name*' buffer you'll see all interactions
between tramp, ssh and your remote host.

Good luck!

Post by David Karr

Post by Ken Brown

Post by David Karr
I've reviewed some of the Emacs tramp documentation, but I'm not sure
what the issue is.
If I'm using Cygwin, I don't need the putty components for this, do I?

No, I make ssh connections through Emacs tramp without putty.

Sorry, I don't know enough about tramp to diagnose this. Maybe it would
help if you would say exactly what commands you gave. And does the

problem

Post by Ken Brown
occur if you start with 'emacs -Q'?

What "commands" am I giving? All I'm trying to do is open a single
file on the remote host.
I'm entering "//fqhn:/home/<myuid>/.bash_profile".
I get different behavior using "emacs -Q". I don't get a timeout
error, but I also don't think it even attempted to connect to the
remote box. The editor view just opens with the given name, but it's
empty (it shouldn't be). The "*Messages*" buffer doesn't indicate
that it ever tried to make a connection. It also says "Use M-x
make-directory RET RET to create the directory and its parents".
The other frustrating issue with my full Emacs configuration is that
when I enter the second forward slash, key response vastly, and I mean
vastly, slows down. I've gone through the tramp FAQ looking for
potential performance issues, but nothing has helped.
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David Karr

2018-01-08 22:28:24 UTC

Permalink

Post by George Prikhodko
Hi,
Have you tried to set in your ~/.emacs file ‘tramp-verbose’ variable?
(setq tramp-verbose 6)
In '*debug tramp/scp remote_host_name*' buffer you'll see all interactions
between tramp, ssh and your remote host.

Well, that's odd. I decided to get back to this, and now I see that
this is working perfectly fine. The only thing I've changed is
setting this verbose variable to 6. However, I then changed it back
to 1 and retested, and it's still working fine.

I'm confused.

Post by George Prikhodko

Post by David Karr

Post by Ken Brown

Post by David Karr
I've reviewed some of the Emacs tramp documentation, but I'm not sure
what the issue is.
If I'm using Cygwin, I don't need the putty components for this, do I?

No, I make ssh connections through Emacs tramp without putty.

Sorry, I don't know enough about tramp to diagnose this. Maybe it would
help if you would say exactly what commands you gave. And does the

problem

Post by Ken Brown
occur if you start with 'emacs -Q'?

What "commands" am I giving? All I'm trying to do is open a single
file on the remote host.
I'm entering "//fqhn:/home/<myuid>/.bash_profile".
I get different behavior using "emacs -Q". I don't get a timeout
error, but I also don't think it even attempted to connect to the
remote box. The editor view just opens with the given name, but it's
empty (it shouldn't be). The "*Messages*" buffer doesn't indicate
that it ever tried to make a connection. It also says "Use M-x
make-directory RET RET to create the directory and its parents".
The other frustrating issue with my full Emacs configuration is that
when I enter the second forward slash, key response vastly, and I mean
vastly, slows down. I've gone through the tramp FAQ looking for
potential performance issues, but nothing has helped.
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