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I am trying to use scripts such as sox and rec without the mic | Ask Ubuntu and recording from PulseAudio | outflux.net

If I ssh into the box and try to run any command such as

pactl list short sources

I get back

root@blue:~# pactl list short sources
No protocol specified
xcb_connection_has_error() returned true
Connection failure: Connection refused
pa_context_connect() failed: Connection refused
root@blue:~#

I get the same if I try parec. Now if I try it from the desktop it works fine. I am using Ubuntu 16.0.4. Any idea what would cause this? Doing the same on CentOS 7 has no such issue.

Dovid Bender
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1 Answers1

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As far as I can tell, xcb_connection_has_error is part of: 

walt@bat:~(0)$ man xcb_connection_has_error
No manual entry for xcb_connection_has_error
walt@bat:~(16)$ man -k xcb_connection_has_error
xcb_connection_has_error: nothing appropriate.
walt@bat:~(16)$ man -k xcb_connection
xcb_connection: nothing appropriate.
walt@bat:~(16)$ man -k xcb
DES_xcbc_encrypt (3ssl) - DES encryption
XGetXCBConnection (3) - get the XCB connection for an Xlib Display
XSetEventQueueOwner (3) - set event queue owner on a shared Xlib/XCB connection

X Windows. What's your $DISPLAY variable set to on both systems? Have you tried the -v, -X and -x options to your ssh command?

Since strings $(type -p pactl) | grep DISPLAY returns 1 (no match), pactl does NOT directly make use of X Windows and cannot get X Windows errors(xcb_connection_has_error).

waltinator
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  • when I ssh into the CentOS box and do echo $DISPLAY I get nothing. On the Ubuntu box if I ssh in remotely it's blank as well. On the Ubuntu box if I do ssh@localhost again $DISPLAY is blank. On the Ubuntu box if I do ssh -X root@localhost then $DISPLAY is localhost:10.0 AND I am able to run parec. Here is what is very interesting. If I ssh in remotely to the ubuntu box parec wont work. However if I now do export DISPLAY=localhost:10.0 the next time I try parec it will work. It will only work so long as there is a local ssh session. If that goes away it stops working. – Dovid Bender Apr 13 '18 at 18:23