I will suggest you to look into SQL configuration manager and look for TCP port. The same port, we need to specify in ePO installer.
I looked there and tried connecting the server with the TCP port that is configured in the SQL conf manager ( the port is open by the way ), and still it shows me the same error with the UDP 1434
is there another way?
What is the port listed in SQL conf manager?
If you can connect to TCP port then I will suggest you to check the other parameters like server name, domain,user name etc.
Are you able to install with SQL user?
Well i managed to connect the ePO to the SQL server, it was a syntax correcrtion
Thanks, nice to hear.