Default connectors in SharePoint Server
APPLIES TO: 
2013 2016 2019 Subscription Edition 
SharePoint in Microsoft 365
The crawler uses connectors to connect to content repositories. In previous SharePoint Server products, connectors were known as protocol handlers.
Default connectors reference
The following table lists the connectors that by default are installed in SharePoint Server, and to which content repositories they connect.
| Connector |
Content repository |
| Bcs |
Business Connectivity Services (internal protocol) |
| Bcs2 |
Business Connectivity Services URLs (internal protocol) |
| File |
File shares |
| http |
Web sites |
| https |
Web sites over Secure Sockets Layer (SSL) |
| Notes |
Lotus Notes databases |
| Rb |
Exchange public folders for versions prior to Microsoft Exchange Server 2003 |
| Rbs |
Exchange public folders over SSL for versions prior to Exchange Server 2003 |
| Sps |
People profiles in Microsoft Office SharePoint Portal Server 2003 |
| Sps3 |
People profiles in Microsoft Office SharePoint Server 2007 |
| Sps3s |
People profiles in Office SharePoint Server 2007 over SSL |
| Spss |
People profiles in SharePoint Portal Server 2003 over SSL |
| Sts3 |
Windows SharePoint Services 3.0 and Office SharePoint Server 2007 sites |
| Sts3s |
Windows SharePoint Services 3.0 and Office SharePoint Server 2007 sites over SSL |
| Sts4 |
Microsoft SharePoint Foundation 2010, SharePoint Server 2010, SharePoint Foundation 2013, SharePoint Server 2013, and SharePoint Server 2016 sites |
| Sts4s |
SharePoint Foundation 2010, SharePoint Server 2010, SharePoint Foundation 2013, SharePoint Server 2013, and SharePoint Server 2016 sites over SSL |