Seaquel
SQL Server error code

SQL Server error 1418

SQL Server raises error 1418 at severity 16, which marks a problem with the query or data that you can correct.

The server network address "%.*ls" can not be reached or does not exist. Check the network address name and that the ports for the local and remote endpoints are operational.
Msg1418
NameDBM_PARTNERNOTFOUND
Severity16
Group1000–1999

What it means

The server network endpoint did not respond because the specified server network address cannot be reached or does not exist.

Source: Database Engine events and errors