Ubisoft Connect connection lost error and how to solve

[WaapS]

Hello, first of all, I solved the problem this way. And so I did research. I would like to share the information I found. Its about MTU.

To find the best MTU value for us, we must run "cmd" as administrator.

Type the netsh interface ipv4 show subinterfaces

command and it will give us a list of all network adapters and the mtu values are on the left.
By default it is "1500" and we need to find the Optimum mtu value.
We need to ping starting from the default value and working our way down. Example;

Type ping google.com -f -l 1472

and as you will see, if you see "loss=4 (100% loss)" in the result, there is 100% loss and the packages need to be fragmented. If your ping is successful, there is no problem.
Note: The default mtu value in VPNs is 1400.

Now let's try to get the last ping by decreasing it by 10 (1462, 1452, 1442...) until we get 0% loss.
Note: It is best not to go below 1400, but if the ping is unsuccessful, you can also try lower values.

I got results at 1462 and there was 0% loss. I increased it by one to find out what the limit was. (1463, 1464..) and I got an error at 1465, so I learned that my limit is "1464". This was my last mtu value.

We will add "28" to this (ip/icmp overheads value) and the result = 1464+28=1492.

In order to use this value, we need to enter one of the following commands. If you are using wifi, the command below is the command above if you are using a cable connection.

netsh interface ipv4 set subinterface "Ethernet" mtu=1492 store=persistent
netsh interface ipv4 set subinterface "Wi-Fi" mtu=1492 store=persistent

As a result, I set the mtu value of 1492 for myself. And ubisoft connect opened properly. I recommend to do it this way too.