I recently [8/1/2009] upgraded to 9.5.1P3. Last evening there were two brief moments that the named process was not resolving out of cache. This is a recursive only server that is basically opened to all clients, mostly for historical reasons. The named process recovered on its own.

While I have seen references to old bugs/issues
https://lists.isc.org/mailman/htdig/bind-users/2005-January/055224.html

This seems to be something different. We're [still] on Red Hat Enterprise Linux AS release 3. Any advice on what to investigate?

Thanks-
-Michael

Aug 17 01:24:53 named[20688]: general: error: socket.c:1577: unexpected error: Aug 17 01:24:53 named[20688]: general: error: internal_send: 144.92.162.225#57060: Invalid argument Aug 17 01:24:53 named[20688]: client: warning: client 144.92.162.225#57060: error sending response: invalid file Aug 17 01:24:53 named[20688]: general: error: socket.c:1577: unexpected error: Aug 17 01:24:53 named[20688]: general: error: internal_send: 216.180.219.44#11059: Invalid argument Aug 17 01:24:53 named[20688]: client: warning: client 216.180.219.44#11059: error sending response: invalid file
...
...
Aug 17 01:25:17 named[20688]: general: error: socket.c:1577: unexpected error: Aug 17 01:25:17 named[20688]: general: error: internal_send: 143.215.143.11#32833: Invalid argument Aug 17 01:25:17 named[20688]: client: warning: client 143.215.143.11#32833: error sending response: invalid file Aug 17 01:25:17 named[20688]: general: error: socket.c:1577: unexpected error: Aug 17 01:25:17 named[20688]: general: error: internal_send: 128.104.22.33#57369: Invalid argument Aug 17 01:25:17 named[20688]: client: warning: client 128.104.22.33#57369: error sending response: invalid file Aug 17 01:25:57 named[20688]: general: warning: checkhints: unable to get root NS rrset from cache: not found



Aug 17 02:38:54 named[20688]: general: error: socket.c:1577: unexpected error: Aug 17 02:38:54 named[20688]: general: error: internal_send: 144.92.166.12#9500: Invalid argument Aug 17 02:38:54 named[20688]: client: warning: client 144.92.166.12#9500: error sending response: invalid file Aug 17 02:38:54 named[20688]: general: error: socket.c:1577: unexpected error: Aug 17 02:38:54 named[20688]: general: error: internal_send: 144.92.166.12#14442: Invalid argument Aug 17 02:38:54 named[20688]: client: warning: client 144.92.166.12#14442: error sending response: invalid file
...
...
Aug 17 02:39:23 named[20688]: general: error: socket.c:1577: unexpected error: Aug 17 02:39:23 named[20688]: general: error: internal_send: 202.108.181.80#50110: Invalid argument Aug 17 02:39:23 named[20688]: client: warning: client 202.108.181.80#50110: error sending response: invalid file Aug 17 02:39:23 named[20688]: general: error: socket.c:1577: unexpected error: Aug 17 02:39:23 named[20688]: general: error: internal_send: 202.108.181.80#37064: Invalid argument Aug 17 02:39:23 named[20688]: client: warning: client 202.108.181.80#37064: error sending response: invalid file
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