upSync uses REST application programming interfaces (APIs) to connect to Xero and Autotask. REST applications use HTTP and HTTPS requests to post data (create and update), read data (such as running queries), and delete data.
upSync will connect to the following HTTP/HTTPS resources
All sensitive data is encrypted and transmitted using HTTPS although some non sensitive data is transmitted using HTTP.
To avoid connectivity issues, please make sure to white list these domains and allow upSync access to the internet through your firewall.