Seamless Multiplayer Updatehttps://support.ubi.com/en-GB/faqs/000025594/Seamless-Multiplayer-Update
If you experience lag, disconnections or other problems regarding the game's connectivity, there are a few steps you can try. We will list them in this FAQ, starting with the most basic ones. We recommend that you follow them in the order they are listed below.
Please be aware that you will need port information for step 3. These are the ports you need for Watch Dogs 2:
TCP: 443, 14000
UDP 9000, 9103, 11100, 11105
TCP 80, 443
Here is the list of steps you can try:
1. Reset network hardware
2. Software conflicts
3. Port forwarding
4. Hosts file
5. Flush DNS
6. External restrictions
If you continue to have trouble after trying these steps, please feel free to contact us!