Does turning off TLS 1.0 on SharePoint 2013 Servers have any impact? We use Infopath 2010 forms on those servers.
Yes it does. We have an InfoPath form that populates various dropdowns with database table queries and if we turn off TLS1.0 those queries stop working with an error message of: "The form cannot connect to the data source. [DBNETLIB][ConnectionOpen (SECCreateCredentials()).]SSL Security error.)”.
I have followed the guide to enabling TLS and SSL support but there must be another step required for InfoPath support that I have so far been unable to find.
There is a series of steps you must follow to enable support for TLS 1.1 and/or TLS 1.2. Once you complete these steps, you should be fine.