Can't use VNC over SSL VPN Connection

Question

Hi Team 
 We use XG125 Firewall. We have configure the SSL VPN Remote users. 
 Over the SSL VPN, the Remote Desktop works fine. However over the SSL VPN, the VNC is not accessible. 
 Please provide me the necessary assistance to get it going as it is affecting our remote users access to the systems in the main office. 
 Looking forward for some quick assistance. 
 Regards 
 Jossy

HuberChristian · Answer

I guess you have correctly configured your Firewall Rules to allow traffic as discussed before in this thread. 
 I had the same issue some weeks ago. The issue was a missconfigured MTU.