we have (I know bad practice) SharePoint 2013 and Confluence Wiki installed on 1 server (obviously Windows Server). My goal is go split those in 2 servers but I am curious if I installed Confluence on Linux would Sharepoint Connector still going to work? What are the caveats if it will work on a linux hosts?
Yes, it will still work. One consideration is that Confluence needs to trust SharePoint's SSL certificate. If you're using a self-signed certificate for SharePoint (hopefully not!), this definitely has to be added to Confluence's keystore. Instructions for doing that on Linux are here: https://confluence.atlassian.com/jira/connecting-to-ssl-services-117455.html#ConnectingtoSSLservices-commandline
If you're using a signed certificate from a well-trusted CA, it should just work without needing to do the import.
Source: Our organization uses the SharePoint Connector and runs Confluence on CentOS 6
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