Hello,
At first, I've noticed you are using quite an old version of Kentico:
5.5.3996
Could you please at least try to apply the latest hotfix for the 5.5 R2 version? The hotfixes can be found
here.
Additionally, could you please describe your setup? Are you trying to setup this Data Source Web part on a live site outside your network? If yes, then your datasource web part doesn't seem to be configured correctly, since you are using an IP address, which is usually used to connect to an computer inside your network (192.168.2.43). Please check with your system administrator, if that's the correct IP address you need to use to connect to your second SQL database.
Best regards,
Boris Pocatko