This post is taken from my old blog xrdp_mm_process_login_response: login failed

If you encountered this error xrdp_mm_process_login_response: login failed when you use the remote desktop connection to connection to a vnc session.

Even if you restart xrdp, the error still remain, the issue could be due to locked  X11 session that was created by xrdp.

To solve the issue, go to the/tmp/.X11-unix/ and find your X session and delete the session.

# cd /tmp/.X11-unix

Do a listing

# ls -l

Look at the session owned by you which you wished to delete

.....
.....
srwxrwxrwx 1 root      root  0 Jul  9  2012 X0
srwxrwxrwx 1 user1  users 0 Jan 25 09:13 X1
srwxrwxrwx 1 user2      users 0 Jul 10  2012 X10
srwxrwxrwx 1 user3     users 0 Feb 19 13:31 X11
srwxrwxrwx 1 user4  users 0 Nov 20 15:10 X12
srwxrwxrwx 1 user5     users 0 Jul 10  2012 X13
.....
.....

Delete the session……

If xrdp still fails, it seems that it is due to orphaned X–. Once xrdp hits an orphaned X– which may or may not be from other users, the error will still remain.

To see the orphaned X11 session, you can do a vncserver, which you will see something like that

# vncserver

Warning: Head-Node:1 is taken because of /tmp/.X11-unix/X1
Remove this file if there is no X server Head-Node:1

Delete all the orphaned X–
Restart the xrdp service and try the remote connection.

# service xrdp restart

If you are still having the issue, do look at alternative solution

1. X Server — no display in range is available. xrdp_mm_process_login_response: login failed

This was an old post from my dated blogger Fixing Authentication is requried to set the network proxy used for download packages for CentOS 6

I encountered this pop-up error today when I was xrdp into my CentOS 6. The error was something like this

authentication is required to set the network proxy used for downloading packages.  
An application is attempting to perform an action that requires privileges.  
Authentication as the super user is required to perform this action" and asking  
for the root password

Non-root users

Step 1: Launch a Terminal Console and type

# gnome-session-properties

Step 2: Uncheck PackageKit Update Applet .

See pix below.

Root User

Step 1: Disabled /etc/yum/pluginconf.d

# vim /etc/yum/pluginconf.d/refresh-packagekit.conf

[main]
enabled=0