Hello Cheong Wee Ting,
"Cannot Connect to GUI" can be that your FGLSERVER variable is not set correctly.
https://4js.com/online_documentation/fjs-fgl-3.21.02-manual-html/#fgl-topics/c_fgl_EnvVariables_FGLSERVER.htmlIf you are working with SSH connect between GDC and FGLGWS, you can use the automatic FGLSERVER setting
https://4js.com/online_documentation/fjs-gdc-3.21.02-manual-html/#gdc-topics/t_gdc_applications_shortcuts_creating_direct.htmlAnd you can think about port forwarding too:
https://4js.com/online_documentation/fjs-gdc-3.21.02-manual-html/#gdc-topics/c_gdc_SSH_port_forwarding.htmlYou are working with GSTSRV (Genero Studio Server). Perhaps there is some other configuration point to check.
I suggest you to open a support ticket. Perhaps we can provide a remote assistance to easy the communication.
Thank you,
Olivier Eckert - Four Js Support