If you are working database on putty terminal at your pc host, you are thinking like to do configure new database use dbca or any other graphical user method. you may jump into GUI linux machine and do your work like vncviewer. Do you know you can able to do from your putty termianl. How? Just download Xmanager software and install on your pc host and set display on putty terminal. The display should be on your pc host ipaddress and also check both side Firewall is turn off.
Check Firewall turn off on both machine ( Linux and pc host ).
Install Xmanager on your host
now go to putty terminal and set display (ipaddres of pc host not linux machine).
[root@testser ~]# su – oracle
[oracle@testser ~]$ export DISPLAY=10.x.xx.xx:0.0
[oracle@testser ~]$ dbca