Xming XDMCP

[Richard Apthorp]

Just can't get XMING 6.9 XDMCP to work on XP!
Running VMS IA64 8.4 (also tried 8.3)
Enabled XDM service

Got the following error:

DKA0:[SYS0.TCPIP$XDM.WORK]t2pc3_0.ERR;1
Xlib: connection to "t2pc3:0" refused by server
Xlib: No protocol specified
[84D 1285760936] xdm error: server open failed for t2pc3:0, giving up

Got this error only after copying XACCESS.TEMPLATE to XACCESS.TXT.

Note:Using EXCURSION XDMCP on another PC works no problem (great product but can't use it any more as retired for Windows 7- shame!)

Any help would be really appreciated, Thanks

[Joseph Huber_1 · Accepted solution]

>> Got this error only after copying XACCESS.TEMPLATE to XACCESS.TXT.

You copied but did not change its content ?
Although the template on my system contains a "*" to allow all, maybe Yours does not or is empty ?

[Joseph Huber_1]

Ah sorry, the message is from the VMS side, so xming had connected: is t2pc3:0 the Xming node?
Is there something in Xming to disable security/allow all access ?

[Jeffrey Goodwin]

>>Is there something in Xming to disable security/allow all access ?

-ac disable access control restrictions

Such as:

xming -multiwindow -ac -xkblayout us_vms -clipboard


-Jeff

[Richard Apthorp]

Did not even get the error before creating XACCESS.TXT. In it there is:

* #any host can get a login window

So assumed this gave the access.

On PC side looked at options but Multiwindow mode not available with XDMCP and nor is the AC option (greyed out)

What is this 'no protocol specfied' error mean?

[Joseph Huber_1]

no protocol specfied ?

all notes I read agree it has to do with Xauthorization.
My VMS is too old to test, it just uses the xsession.txt.
Maybe tcpip$xdm simple xaccess.txt authorization does not work well together with newest decwindows/motif.
What happens when You remove the xaccess.txt file again ?

[Richard Apthorp]

When delete xaccess.txt still fails on PC (blank X window) but then no error message file

Just tried to connect to a VMS 7.3-1 box
Now get different error in file:

DKA0:[SYS0.TCPIP$XDM.WORK]159_75_55_143_3.ERR;3

xdm error (pid 289): IO Error in XOpenDisplay


Checked Excursion XDMCP and works here as well.
Noticed the LOGIN prompt is different using Excursion XDMCP (not full X window but small borderless white window). Full X window only appears after Login - could this me causing Xming a problem?

[Joseph Huber_1]

I just have the same combination VMS 7.3-1 and xming.
It works with XLaunch/singlewindow/xdm and having xaccess.txt.

So probably the newer VMS/Decw/TCPIP combination requires something else, hope someone in this forum listens.

[Richard Apthorp]

Thanks for checking it out -are you saying it works with V7.3-1 (TCPIP services V5.3)?

This is what I have tried and failed so I must have missed doing something?
Did you have do modify xaccess.txt?
Did you use the Xming Xlaunch facility?

[Joseph Huber_1]

I use tcpip 5.4, but it was also working with 5.3.
I did modify xaccess.txt, but just removed the "*" (allow all), and explicitly used a list of node-names allowed to connect.

On the xming side I use XLaunch with XDM , and do nothing else specifically.

[Joseph Huber_1]

>>
Noticed the LOGIN prompt is different using Excursion XDMCP (not full X window but small borderless white window). Full X window only appears after Login - could this me causing Xming a problem?
<<
No, the XDM login screen is normal (built into XDM server), it certainly is not the reason for xming not working.

[Joseph Huber_1]

In addition check this thread:
http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1285786776721+28353475&threadId=1304413

I'm not sure if I have xming access control off using the xming configuration file, through the XLaunch menu it is not possible.
Can check tomorrow how my setup looks like (no MS WIN at home :-)

[Joseph Huber_1]

I checked my Xming setup on WinXP, and I see nothing concerning display protection in Xmingrc.
Using 'blank" XLaunch, also no access control flag.
Maybe the defaults of Xming have changed. Just use Xming setup menu once , SAVE the config, and then add in the saved file before the closing "/>":

NoAccessControl="true"

And start using the saved config to see if it now works.

[Richard Apthorp]

Got it working - You are right it was the Access Control.
When I use Xming Xlaunch Edit even though Access Control greyed out, there is an additional parameters line where I put "-ac"
Thanks

[Richard Apthorp]

Closed