Geez, I have just spent an hour reading about SQL servers and ADODB. There is a lot of info on Google about this error message. I have two suggestions that might work. Shut down your browser and empty the cache and then try connecting again. 2ndly, and this is kind of extreme, but it fits the info on the error message, (The following info was given in regards to user agent problem)
If you want to remove it then open REGEDIT and traverse to the following hive:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\User Agent\Post Platform
and delete the String Value: Avant Browser avantbrowser.com]
you will need to repeat this every time you upgrade/reinstall the browser as it is recreated each time
Thanks to auroras for this info about user agent and how to change it.