Okay, I installed GanttProject on a PC in our Lab and it worked fine. While it’s also not working on a colleague’s PC I would say it’s totally not a problem of GanttProject but some local Firewall rules or whatever made by our IT (the lab PC is for some reason not updated sometimes).
Do you maybe have an idea what I can ask our IT to change in order to have access to the cloud project?
It’s totally the same (the validity is shown in CET/CEST of course) except that “GTS Root R4 / WE 1” in the hierarchy is missing
I think you need to describe the issue to them. Like “Hello folks, GanttProject desktop application can’t make HTTPS requests to ganttproject.cloud due to issues with the SSL certificates. It works fine on other PCs, so I guess the issue is in my PC/ our network configuration”.
In case if they instruct you to use a proxy server, GanttProject supports it via the config file.
That’s probably the issue. It appears that two out of three certificates in the chain disappear somewhere on the path from the server to your PC.
You may also try adding this line into ganttproject.ini file in your GanttProject installation folder (C:\Program Files (x86)\GanttProject-3.3):
-Djavax.net.debug=ssl
This will turn on SSL debug information output to the log file.