Players who receive an error stating "Unable to Connect to Server" should check their internet connection for any network or service outages and follow the process below:
See if there are any known problems with the PlayStation Network online service: https://status.playstation.com/en-us/.
Check all the physical devices on the network to ensure they are plugged in and powered on.
Perform a connection test on each device connected to the network.
Players can refer to this link for more information on how to connect to the PSN network: http://faq.en.playstation.com/app/answers/detail/a_id/7767/~/unable-to-connect-to-psn.
We also recommend that players use an ethernet cable instead of a wireless connection.
If they are unable to identify the issue, players should verify their network and perform a connection test on the console first. This is explained here: http://manuals.playstation.net/document/en/ps4/settings/nw_test.html.
We also recommend players ensure that the ports needed for the game and PSN are open. The ports for our game and PSN are as follows:
TCP Ports 10040 through 10060
UDP Ports 50000 through 60000
UDP Ports 12000 through 32000
UDP Port 6250
UDP Port 5060
UDP Port 5062
UDP Port 3478 through 3479
TCP Port 80
TCP Port 433
If the above steps do not resolve the issue, we recommend players contact PlayStation's Customer Support: https://support.us.playstation.com/app/contact_options.