I’m having the same issue. Cannot connect to server at opening screen. Just bought the game via steam today. I do not have any firewall blocking outbound traffic. It is a NAT connection through my router but I don’t have any issues playing other games or running other communications software.
Here are my system specs.
OS: Fedora Linux 30. Linux kernel 5.0.11 using kernel GPU drivers.
Motherboard: Supermicro X10SRA
CPU: Intel Xeon CPU E5-1620 v3 @ 3.50GHz
Memory 128GB ECC DDR.
Disk drive: Samsung 850 Pro SSD 512GB, XFS filesystem.
GPU: Saphire AMD RX580 with 8GB DDR ram.
Monitor: Dell Ultruwide U3417W