The cause may be the setting of the port number. Would you try to turn off your local Firewall if you set it on?
Same exact scenario for me.
My specs are:
32gb of DDR4 Corsair RAM
Samsung 960 Pro M.2 SSD
I bought this PC (roughly $3600) at the time, for the express purposes of rendering with Cinema 4D and After Effects CC 2017.
I haven't been able to find a solution to this problem and there is ZERO help on this issue on the internet.
"Run as administrator" doesn't help
Reinstalling doesn't help
My only way to get out of that is to Ctrl + Alt + Delete and and end the After Effects process.
I have Live Link enabled too in Cinema 4D:
I would also like to add that I have had ZERO problems for months up until just today. Very strange as I have changed not a single thing on my PC at all.
i had this problem a while back, iirc the workaround I used was to move the entire project folder to my C drive's base directory and that randomly fixed it, like this
hope this helps!