>> Details would be welcome.  The biggest offender we found was that the
>> portmapper interfaces would use reserved ports.  That is simply not
>> necessary, and those issues have been fixed in autofs and mount.nfs.  In
>> fact, we've got regression tests that make sure that this is the case.
>
> since i had my hang last night i have dug back into this.  the big culprit
> is getgrouplist (or so it seems) that opens the group.byname map with a yp
> all call and it does that from a privileged port.  watching my mail
> server, i see it burn through priv ports at quite a rapid clip (5 per
> second or so).  i am going to see why it doesn't use the netid map.  it
> could just be glibc not having that feature.

aha!  there is a file /etc/default/nss where you can enable nis to use the 
netid map.  NETID_AUTHORITATIVE=TRUE is the key.  and that has made a huge 
difference on my server.

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