Selectively using secure connection to SQL Server
Secure connection to SQL Server can be enforced by different ways, e.g. forcing encryption by using “ForceEncryption” property under the Network Configuration in the server. But this setting will force all clients to use encryption and any client that is not able to use an encrypted connection will fail.
If you need to connect to SQL Server selectively here is how to achieve this:
You can take advantage of the two client settings, “Force Protocol Encryption” and “Trust Server Certificate” and two connection string parameters, “Encrypt” and “Trust Server Certificate”. The table below describes different combinations of these flags and the corresponding behavior.
Force Protocol Encryption client setting |
Trust Server Certificate client setting |
Connection string/connection attribute Encrypt/Use Encryption for Data |
Connection string/connection attribute Trust Server Certificate |
Result |
|
1. |
No |
N/A |
No (default) |
Ignored |
No encryption occurs. |
2. |
No |
N/A |
Yes |
No (default) |
Encryption occurs only if there is a verifiable server certificate, otherwise the connection attempt fails. |
3. |
No |
N/A |
Yes |
Yes |
Encryption always occurs; certificate is not validated by the client. |
4. |
Yes |
No |
Ignored |
Ignored |
Encryption occurs only if there is a verifiable server certificate, otherwise the connection attempt fails. |
5. |
Yes |
Yes |
No (default) |
Ignored |
Encryption always occurs, but certificate is not validated by the client. |
6. |
Yes |
Yes |
Yes |
Comments
Anonymous
December 03, 2009
We have just recently upgraded to Sql2005 from 2000. Our main application uses services which are written in Ms Java 6.0. One service in particular is used very frequently to receive data over a port and enter it into the application database. We use java and com classes in com.ms.wfc.data.*. In particular we use com.ms.wfc.data.Connection to create a Connection to the database. We are experiencing com error "Failed remote creation of coclass com/ms/wfc/data/adodb/Connection" We are using a connection string like "Driver={SQL Server};SERVER=FINFANTE;DATABASE=UltraCare;UID=CareUser;PWD=pwd;APP=Infinity;" What is happening is that after creating and using several Connections successfully, and storing data in the db successfully, then after a short period like a minute or 2, the next attempt to create a Connection fails with the com error. Nothing like this had ever happened with sql 2000. We have tried using different drivers and/or providers and are still getting the same error. Any clues about how to proceed debugging would be greatly appreciated.Anonymous
January 04, 2010
good article.. no del please..