How to fix error Delta 20010186 on PC?
Check the system time on the computer. If it is not accurate you will not be allowed in the game.
Method 1
If you are using VPN software, you will need to remove it. Restart the computer and try to log in the game again. In most cases, it helps to solve the error Delta 20010186.
Method 2
Open CMD as ADMIN and enter the following:
4 lines one by one then restart computer:
netsh advfirewall reset
netsh int ip reset
netsh int ipv6 reset
netsh winsock reset
Method 3
Make sure that your firewall is not blocking these ports. These ports must be open for the game to work properly. UDP: 33000 to 33499 TCP: 27015, 51000, 55000 to 55999, 56000 to 56999
Read more:
http://techfaqs.net/games/how-to-fix-error-delta-20010186-in-tom-clancys-the-division/