All games are likely to have connection errors.
World War Z Aftermath is no exception.
Go toDowndetectorto see if the server is under maintenance or having outage.

If the server is not at its downtime, just move to the solutions below.
Therefore, yo close all the running programs and launch the game after rebooting your rig.
Heres how to do it:
Step 1.
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PressWin+Sto evoke theWindows searchbar.
Typecmdand right-click onCommand Promptto selectRun as administrator.
In the command window, throw in the 5 commands below and hitEnterafter each.

ipconfig /flushdns
ipconfig /release
ipconfig /renew
netsh winsock reset
netsh int ip reset
Step 4.
After completion, reboot your system to inspect if the connection to WWZ Services failed again.
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Solution 6: Set up Google Public DNS
Step 1.
Head toNetwork and Internet>data pipe and Sharing Center>Change adapter prefs.
Right-choose the connection you are currently using and selectProperties.
In theNetworkingsection, click onInternet Protocol Version 4 (TCP/IPv4)and hitProperties.
TickUse the following DNS server addressesand replace the IP address with the following:
Step 6.
Click onOKto save the changes youve made.
Solution 7: Check Your NAT pop in
Verify yourNAT pop in.
The connection might be blocked by your router if it is punch in 3 (Strict).
Try plugging your cable straight into your console or PC to see if the connections change.
Luckily, you might easily overcome it with these solutions above.