Asterisk unable to do DNS lookups

I've noticed on several occasions that if Asterisk starts without a network
connection, then even if the network connection is restored, DNS lookups
fail.

 

After the connection is restored I can successfully do NSLOOKUPs from the
command line, but the IAX2 registration attempts keep failing because
Asterisk has a problem.

 

My questions are:

1.       Is there a way to make Asterisk update (whatever is wrong) and
resume successful DNS lookups?

2.       Is there a way from the Asterisk CLI to detect when Asterisk enters
this state of failed DNS lookups?  (Other than tracking IAX2/SIP
registration failures)

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