+5807. [bug] Add a TCP "write" timer, and time out writing
+ connections after the "tcp-idle-timeout" period
+ has elapsed. [GL #3132]
+
5806. [bug] An error in checking the "blackhole" ACL could cause
DNS requests sent by named to fail if the
destination address or prefix was specifically
to ``none``. ``blackhole`` worked correctly when it was left unset, or
if only positive-match elements were included. This has now been fixed.
:gl:`#3157`
+
+- TCP connections could hang indefinitely if the TCP write buffers
+ were full because of the other party not reading sent data. This has
+ been fixed by adding a "write" timer. Connections that are hung
+ while writing will now time out after the ``tcp-idle-timeout`` period
+ has elapsed. :gl:`#3132`