Doing dhcp_release() in close_tun() does resolve this. And release appears to work without needing admin rights, so this could be a fix for the problem I reported -- not necessarily a fix for Track 665 and similar reports with one adapter and multiple remotes.
Some Windows users are getting the Error 807 'The network connection between your computer and the VPN server was interrupted. This can be caused by VPN VPN Error 807 is a common VPN error. Error 807: The network connection between your computer and the VPN server was interrupted. If you receive the VPN 807 error, it is possible that the problem is caused by your firewall. To solve the problem, you must find your VPN client in your firewall and make sure that your VPN is allowed to pass through it. Sometimes when using a VPN, you could encounter some problems such as Error 807: Network connection between your computer and VPN server was interrupted."
[PS3] Error Code 807 - Forums - Battlelog / Battlefield 3
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Pytorch解决 RuntimeError: CuDNN error: …
How to Fix VPN Error 807 - Network Connection Interrupted