Manual CM client install fails over VPN

Question

Hello, we are having an issue where the Configuration Manger client is installing successfully on client computers on the network, but the install/communication is failing on VPN-connected clients outside the office. I have checked the ccmsetup.exe log and there appear to be many error, but I have not been able to determine at which point the setup fails.

Can anyone help to point me in the right direction, anything standing out that I should look into? Thanks in advance.ccmsetup.log