I have an application running in a FreeBSD jail that opens TCP connections to other servers. When I try to shutdown the jail shortly after opening a connection, it fails to unmount the filesystem with "device busy". I've tried all manner of sysctl options and server.SetKeepalivesEnabled(false) and similar functions, but nothing has any effect. I think it might be because there are a lot of places in the code this can happen and some of the connections might be getting opened by code in other repos I'm importing. Is there an easy way to just close all open TCP connections?
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