The secure connection between Xero and Bluechain is managed through the use of keys passed between both applications. These keys have certain time limits and can expire if a connection has not been used for some time. Reconnecting to Xero allows for new keys to be passed between the apps, enabling the connection to be re-established.
It's as simple as re-logging into the Bluechain integration site in order to do this.
Go to integration.bluechain.com and click sign up using Xero
Log in to Xero (if required)
Confirm access to your Xero data. Click continue, even if your organisation in the drop-down is connected.
You should see your Xero organisation re-connected to Bluechain