Zenon 7 & SQL errors

Zenon 7 & SQL errors

Dear colleagues,
Good day.
We have the multiuser project. All was working properly, but today on the PC I`ve got the error message. So I can`t accept the changes of the variables and so on.
DBCLI: CheckInSQL - elements in table ProcessVariable could not be checked in. Error: The command contained one or more errors.SQL Server Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF].
SQLState is 42000
Error code is 65535OLE DB provider "SQLNCLI10" for linked server "AZININA\ZENON_2008R2" returned message "A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online.".
SQLState is 01000
Error code is 7412OLE DB provider "SQLNCLI10" for linked server "AZININA\ZENON_2008R2" returned message "Login timeout expired".
SQLState is 01000
Error code is 7412 Execute command failed. Errorcode:128

Please see the LOG in the attachment. What is the reason? And what to do?
Regards.

This is a migrated post! Originally posted on 11.09.2012 by user croc. Please be aware that information can be outdated.