All of us have had to deal with setting up connection strings to various databases and backend SQL servers. One of the best resources out there for general connection strings is http://www.connectionstrings.com/ They have connection strings in all kinds of variations for over 30 different database servers. In addition to that they have connecton strings to all sorts of datafiles, such as Excel, Access, even text files! Connection strings to MS Azure, MS Sharepoint, Active Directory and Lotus Notes are also available.
http://www.connectionstrings.com/ is absolutely invaluable when it comes to construct connection strings to the various databases we have to work with. Check it out!