Please make sure below points:

1- Have you installed SQL Server compatiable version. If not please make sure that you have compatiable sql server client installed.

2- Have you recently restored you SDE database into another database. If that's the case then there is conflict between the configuration of SDE generated schema, as it will hold the name of previous database but your current new database name is Change.d

3- Normally, these types of errors occur, if there is something wrong with the ArcSDE schema of sql server database.

Make sure of these points:

1. Have you installed SQL Server compatiable version. If not please make sure that you have compatiable sql server client installed.
2. Have you recently restored you SDE database into another database. If that's the case then there is conflict between the configuration of SDE generated schema, as it will hold the name of previous database but your current new database name is Changed.
3. Normally, these types of errors occur, if there is something wrong with the ArcSDE schema of sql server database.