We have purchased new hardware to replace our VPN servers. We anticipate needing a full day to swap out the hardware and ensure the configuration on the new machines is correct, during which the VPN service will be unavailable. Sunday, September 22 is our proposed day for completing this work. If you know of any reason why this is not a good day (conference? workshop? field project?), please let us know as soon as possible at firstname.lastname@example.org.
We do anticipate being able to complete the work by 5 PM, and there will be no changes necessary on the client end. Everything will work and look exactly the same for end users after a successful switchout.