DNS query failed/res_mkquery failed

[Suresh M]

 We have been using FreeBSD as server last 5 years without any problems at
all.   My formerly beautiful NIS system is now acting strangely.  I'm
getting lots of res_mkquery failures, and now ypserv will often refuse to
start up, giving me the message:
    unable to register (YPPROG, YPOLDVERS, udp)

man pages don't seem to be helpful on these errors (unless I'm missing
something?).

Jul 18 18:13:41 ypserv[470]: res_mkquery failed for
159607157543155842159299158288157898157829
1578301553671564461556201571651578461584561575851564611601731572791552241591261584611579151603671596
64158616160527161226157327159332161840160713160382161611 type 1
Jul 18 18:13:41 ypserv[470]: DNS query failed
Jul 18 18:13:41 ypserv[470]: res_mkquery failed for
159607157543155842159299158288157898157829
1578301553671564461556201571651578461584561575851564611601731572791552241591261584611579151603671596
64158616160527161226157327159332161840160713160382161611 type 1
Jul 18 18:13:41  ypserv[470]: DNS query failed
Jul 18 18:13:41  ypserv[470]: res_mkquery failed for
159607157543155842159299158288157898157829
1578301553671564461556201571651578461584561575851564611601731572791552241591261584611579151603671596
64158616160527161226157327159332161840160713160382161611 type 1
DNS query failed



Mine is a FreeBSD 6.2 OS. Any ideas ?

The machine got stuck frequently after getting these errors in a large
volume.

Any ideas ?