reverse lookup validation failed - how do I fix this?

Hi all,

I see a of these in my log files:


Mar 31 02:01:39 newsfeed nnrpd[3339866]: ? reverse lookup for
2001:41d0:a:280::1 failed: reverse lookup validation failed -- using IP
address for access

Mar 31 02:01:39 newsfeed nnrpd[3339866]: ? reverse
lookup for 2602:fe64:8::7 failed: reverse lookup validation failed --
using IP address for access


Odd thing is, both have RDNS entries. the first is for news.nntp4.net
and the 2nd is for my own server, newsfeed.endofthelinebbs.com


Interestingly, news.nntp4.net does not resolve back to that IP, it uses
2001:41d0:700:1273::

Mine definitely does, however.

open to suggestions.

Thanks.

--
End Of The Line BBS - Plano, TX
telnet endofthelinebbs.com 23