PuTTY X11 proxy: wrong authentication protocol attempted

I was able to finally figure out a solution. The problem seems to have been with the .Xauthority file (see below).

$ xclock

Error :- PuTTY X11 proxy: wrong authentication protocol attemptedError: Can't open display: localhost:10.0

Solutions.

1. Install xauth

$ sudo apt-get install xauth

2. Check xauth list

$ xauth list

xauth: file /root/.Xauthority does not exist

3. Verify "X11Forwarding yes" enable or not

$ sudo cat /etc/ssh/sshd_config | grep -i X11

X11Forwarding yes

X11DisplayOffset 10

4. if not enabled "X11Forwarding yes" then enable it.

$ sudo nano /etc/ssh/sshd_config

X11Forwarding yes

5. Copy Xauthority file from user to root folder.

$ sudo cp /home/user/.Xauthority /root/

6. Check it's working now.

$ xauth list

ubuntuserver/unix:11 MIT-MAGIC-COOKIE-1 577159a43b6ecb02b2872a875f70297c

ubuntuserver/unix:10 MIT-MAGIC-COOKIE-1 a4343c811e7322743820799b016abbe1

7. Now it's working fine.

$ xclock

$ nedit

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