Check the following box on Putty client:Connection -> SSH -> X11 -> "Enable X11 forwarding"
Additional Notes:
There is a known issue with stock Solaris SSH, Bug 6704823 Fix for 6684003 prevents ssh from X forwarding on IPv4-only system, was filed with Solaris/ssh:
Disable IPv6 ssh support and change ListenAddress to 0.0.0.0 in /etc/ssh/sshd_config, then restart sshd with the "-4" option. For example:
svcadm -v disable ssh
/usr/lib/ssh/sshd -4
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