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Date:      Wed, 10 Mar 2021 16:24:08 -1000
From:      "parv/freebsd" <parv.0zero9+freebsd@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Switched to VNC, after testing ForwardX11Timeout - Re: Remote (CentOS 8) X11 clients stop spawning on local (FreeBSD 12) X11 server over ssh after some time
Message-ID:  <CABObuOqM50Z=y0niC_m1scx98pS2U3CtEUbcaHRB3kwKeY+UWg@mail.gmail.com>
In-Reply-To: <CABObuOoq=ma99PNVN2RyF1hgrHF4ynuQCzPOMRsBY1W0+04zmA@mail.gmail.com>
References:  <CABObuOr6_WFb10YpcLk2wW2Vhbcd+G2FT78BpFwQV9-FuV_R2A@mail.gmail.com> <CABObuOoq=ma99PNVN2RyF1hgrHF4ynuQCzPOMRsBY1W0+04zmA@mail.gmail.com>

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On Sun, Feb 28, 2021 at 11:19 PM parv/freebsd wrote:

> On Sun, Feb 28, 2021 at 8:18 PM parv/freebsd wrote:
>
> I had started ssh -X connection 2+ days ago in X11 on FreeBSD 12-STABLE to
>> CentOS 8.
>> When I tried to run Firefox (on CentOS), it did not start & blurted ...
>>
>>   Unable to init server: Broadway display type is not supported:
>> localhost:13.0
>>   Error: cannot open display: localhost:13.0
>>
> ...
>
> So, "ssh -vv -X" shows "Rejected X11 connection after ForwardX11Timeout
> expired",
> I do not see that option in /etc/ssh/ on CentOS or FreeBSD. Hold on ...
>
> This ...
>
>
> https://security.stackexchange.com/questions/147293/openssh-is-setting-a-long-forwardx11timeout-better-than-forwardx11trusted
>
> ... points to ...
>
>   https://github.com/openssh/openssh-portable/commit/1ab6a51
>
> ... which makes "ForwardX11Timeout" to be ssh client option. On to testing
> ...
>

The X11 connection seemed to have stayed after setting the option in
~/.ssh/config ...

  Host *
    ...
    ForwardX11Timeout 345600

In any case, I am now a SSH-VNC tunnel convert (TigerVNC installed on both
ends) ...

  HowTo: Tunneling VNC Connections over SSH,

https://www.cyberciti.biz/tips/tunneling-vnc-connections-over-ssh-howto.html

... starting & setting up VNC server on CentOS side was somewhat convoluted
...

  novncserver on CentOS8 #1161, comment by astronomerdave, Dec 15, 2020,
  https://github.com/TigerVNC/tigervnc/issues/1161#issuecomment-745569986

The interaction (xterm almost all the time) is certainly faster now over
100 Mb/s connection compared to plain X11 connection. In the latter case
-- still subject to time out -- using XLFD (X Logical Font Description)
font instead of TTF[0] helped some.


 - parv


0- If true type font has been enabled locally, then xterm can be started
without ...

  xterm -xrm 'XTerm.VT100.renderFont:False' \
    -fn '-misc-liberation mono-bold-r-normal--24-0-0-0-m-0-iso10646-1'

  ... and/or set .renderFont & .font[1-6]? resources in in ~/.Xresources.



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