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mDNSPlatformSendUDP Error, slowly Network

Since I have updated our Mac XServer with the last securety update 2007-07 for 10.4.10, our network is slowly. by login on our open directory and by mail and internet service.
Our Xservers get faster and the network after we have done a reboot of our servers.
The network gets slowly again after 2 to 3 hours.
Only one of our three server has the following entry into the system.log:

Aug 12 03:15:01 mainserver cp: error processing extended attributes: Operation not permitted
Aug 12 03:15:01 mainserver cp: error processing extended attributes: Operation not permitted
Aug 12 03:15:02 mainserver 700.daily.server.cyrus: Error: /etc/MailServicesOther.plist postfix does not contain a dictionary with key log rollingdays.
Aug 12 03:15:02 mainserver cp: error processing extended attributes: Operation not permitted
Aug 12 03:15:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 702135946
Aug 12 03:17:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 702255950
Aug 12 03:30:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 703035971
Aug 12 03:32:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 703155973
Aug 12 03:42:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 703755989
Aug 12 03:45:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 703935993
Aug 12 03:55:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 704536010
Aug 12 03:57:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 704656013
Aug 12 04:10:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 705436033
Aug 12 04:12:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 705556037
Aug 12 04:25:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 706336056
Aug 12 04:37:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 707056075
Aug 12 04:48:58 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 707718097
Aug 12 04:49:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 707776095
Aug 12 04:50:08 mainserver dashboardadivsoryd[3120]: fetch-parsers: unable to fetch data from read stream
Aug 12 04:50:08 mainserver dashboardadivsoryd[3120]: fetch: unable to fetch data from read stream while fetch advisory list
Aug 12 04:51:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 707896097
Aug 12 04:53:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 708016100
Aug 12 05:05:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 708736119
Aug 12 05:07:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 708856122
Aug 12 05:17:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 709456139
Aug 12 05:30:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 710236159
Aug 12 05:32:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 710356162
Aug 12 05:45:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 711136183
Aug 12 05:47:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 711256186
Aug 12 05:57:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 711856202
Aug 12 06:00:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 712036206
Aug 12 06:12:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 712756225
Aug 12 06:25:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 713536247
Aug 12 06:27:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 713656250
Aug 12 06:40:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 714436269
Aug 12 06:52:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 715156288
Aug 12 06:55:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 715336293
Aug 12 07:05:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 715936308
Aug 12 07:07:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 716056311
Aug 12 07:20:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 716836332
Aug 12 07:32:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 717556351
Aug 12 07:35:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 717736355
Aug 12 07:45:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 718336371
Aug 12 07:47:56 mainserver mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 718456374

This system.log is from our DNS XServer

Our network looks as following:
First Xserver = DNS, Opendirctory Master (MOD), Printserver, AFP. Firewall, 192.168.100.2
Second Xserver = Secondare Cone DNS, Replica OD, Web, Firewall, 192.168.100.3
Third Xserver = Fileserver with 4D, Firewall.
On all servers run MacOSX 10.4.10 with the last security update.
Our network is connected with the internet of a rooter.

The first Xserver DNS, shows following named.log entries:
onfiguration from '/private/etc/named.conf'
10-Aug-2007 16:38:26.860 client 192.168.100.2#5353: update 'domain.private/IN' denied
10-Aug-2007 16:38:26.889 client 192.168.100.2#5353: update 'domain.private/IN' denied
10-Aug-2007 16:41:37.182 client 192.168.100.3#5353: update 'domain.private/IN' denied
10-Aug-2007 16:41:37.212 client 192.168.100.3#5353: update 'domain.private/IN' denied
10-Aug-2007 19:57:29.935 shutting down
10-Aug-2007 19:57:29.935 stopping command channel on 127.0.0.1#54
10-Aug-2007 19:57:29.935 no longer listening on 127.0.0.1#53
10-Aug-2007 19:57:29.935 no longer listening on 192.168.100.2#53
10-Aug-2007 19:57:29.937 exiting
10-Aug-2007 19:58:07.996 named.local:11: ignoring out-of-zone data (1.localhost)
10-Aug-2007 19:58:08.205 zone 0.0.127.in-addr.arpa/IN: loaded serial 2007063039
10-Aug-2007 19:58:08.206 zone 100.168.192.in-addr.arpa/IN: loaded serial 2007063000
10-Aug-2007 19:58:08.428 zone localhost/IN: loaded serial 42
10-Aug-2007 19:58:08.431 zone domain.private/IN: loaded serial 2007063037
10-Aug-2007 19:58:08.431 running
10-Aug-2007 19:58:11.428 loading configuration from '/private/etc/named.conf'
10-Aug-2007 19:58:15.218 loading configuration from '/private/etc/named.conf'
10-Aug-2007 19:58:15.735 loading configuration from '/private/etc/named.conf'
10-Aug-2007 19:58:15.736 listening on IPv4 interface en0, 192.168.100.2#53
10-Aug-2007 19:58:18.758 loading configuration from '/private/etc/named.conf'
10-Aug-2007 19:58:22.381 client 192.168.100.2#5353: update 'domain.private/IN' denied
10-Aug-2007 19:58:22.410 client 192.168.100.2#5353: update 'domain.private/IN' denied
10-Aug-2007 20:00:32.660 client 192.168.100.3#5353: update 'domain.private/IN' denied
10-Aug-2007 20:00:32.689 client 192.168.100.3#5353: update 'domain.private/IN' denied
10-Aug-2007 22:04:23.593 loading configuration from '/private/etc/named.conf'
10-Aug-2007 22:07:02.846 shutting down
10-Aug-2007 22:07:02.846 stopping command channel on 127.0.0.1#54
10-Aug-2007 22:07:02.846 no longer listening on 127.0.0.1#53
10-Aug-2007 22:07:02.846 no longer listening on 192.168.100.2#53
10-Aug-2007 22:07:02.848 exiting
10-Aug-2007 22:07:12.510 named.local:11: ignoring out-of-zone data (1.localhost)
10-Aug-2007 22:07:12.510 zone 0.0.127.in-addr.arpa/IN: loaded serial 2007063039
10-Aug-2007 22:07:12.511 zone 100.168.192.in-addr.arpa/IN: loaded serial 2007063000
10-Aug-2007 22:07:12.512 zone localhost/IN: loaded serial 42
10-Aug-2007 22:07:12.513 zone domain.private/IN: loaded serial 2007063037
10-Aug-2007 22:07:12.513 running
10-Aug-2007 22:21:41.706 shutting down
10-Aug-2007 22:21:41.706 stopping command channel on 127.0.0.1#54
10-Aug-2007 22:21:41.706 no longer listening on 127.0.0.1#53
10-Aug-2007 22:21:41.706 no longer listening on 192.168.100.2#53
10-Aug-2007 22:21:41.708 exiting
10-Aug-2007 22:22:20.625 named.local:11: ignoring out-of-zone data (1.localhost)
10-Aug-2007 22:22:20.625 zone 0.0.127.in-addr.arpa/IN: loaded serial 2007063039
10-Aug-2007 22:22:20.627 zone 100.168.192.in-addr.arpa/IN: loaded serial 2007063000
10-Aug-2007 22:22:20.627 zone localhost/IN: loaded serial 42
10-Aug-2007 22:22:20.629 zone domain.private/IN: loaded serial 2007063037
10-Aug-2007 22:22:20.629 running
10-Aug-2007 22:22:25.264 loading configuration from '/private/etc/named.conf'
10-Aug-2007 22:22:28.245 loading configuration from '/private/etc/named.conf'
10-Aug-2007 22:22:28.752 loading configuration from '/private/etc/named.conf'
10-Aug-2007 22:22:28.753 listening on IPv4 interface en0, 192.168.100.2#53
10-Aug-2007 22:22:31.575 loading configuration from '/private/etc/named.conf'
10-Aug-2007 22:22:35.696 client 192.168.100.2#5353: update 'domain.private/IN' denied
10-Aug-2007 22:22:35.727 client 192.168.100.2#5353: update 'domain.private/IN' denied
10-Aug-2007 22:24:53.064 client 192.168.100.3#5353: update 'domain.private/IN' denied
10-Aug-2007 22:24:53.094 client 192.168.100.3#5353: update 'domain.private/IN' denied
11-Aug-2007 08:00:54.678 client 192.168.100.3#5353: update 'domain.private/IN' denied
11-Aug-2007 08:00:54.708 client 192.168.100.3#5353: update 'domain.private/IN' denied
11-Aug-2007 16:34:20.493 unexpected RCODE (SERVFAIL) resolving 'img-cdn.mediaplex.com/A/IN': 192.168.100.1#53
11-Aug-2007 16:34:20.594 unexpected RCODE (SERVFAIL) resolving 'img-cdn.mediaplex.com/A/IN': 192.168.100.1#53
11-Aug-2007 16:34:24.413 unexpected RCODE (SERVFAIL) resolving 'img-cdn.mediaplex.com/A/IN': 192.168.100.1#53
11-Aug-2007 16:34:24.514 unexpected RCODE (SERVFAIL) resolving 'img-cdn.mediaplex.com/A/IN': 192.168.100.1#53
11-Aug-2007 16:38:45.595 unexpected RCODE (SERVFAIL) resolving 'altfarm.mediaplex.com/A/IN': 192.168.100.1#53
11-Aug-2007 16:38:45.785 unexpected RCODE (SERVFAIL) resolving 'altfarm.mediaplex.com/A/IN': 192.168.100.1#53
11-Aug-2007 18:29:55.728 shutting down
11-Aug-2007 18:29:55.728 stopping command channel on 127.0.0.1#54
11-Aug-2007 18:29:55.728 no longer listening on 127.0.0.1#53
11-Aug-2007 18:29:55.728 no longer listening on 192.168.100.2#53
11-Aug-2007 18:29:55.730 exiting
11-Aug-2007 18:37:36.785 named.local:11: ignoring out-of-zone data (1.localhost)
11-Aug-2007 18:37:37.022 zone 0.0.127.in-addr.arpa/IN: loaded serial 2007063039
11-Aug-2007 18:37:37.023 zone 100.168.192.in-addr.arpa/IN: loaded serial 2007063000
11-Aug-2007 18:37:37.024 zone localhost/IN: loaded serial 42
11-Aug-2007 18:37:37.030 zone domain.private/IN: loaded serial 2007063037
11-Aug-2007 18:37:37.031 running
11-Aug-2007 18:37:41.899 loading configuration from '/private/etc/named.conf'
11-Aug-2007 18:37:44.865 loading configuration from '/private/etc/named.conf'
11-Aug-2007 18:37:45.402 loading configuration from '/private/etc/named.conf'
11-Aug-2007 18:37:45.403 listening on IPv4 interface en0, 192.168.100.2#53
11-Aug-2007 18:37:46.716 loading configuration from '/private/etc/named.conf'
11-Aug-2007 18:37:50.652 client 192.168.100.2#5353: update 'domain.private/IN' denied
11-Aug-2007 18:37:50.682 client 192.168.100.2#5353: update 'domain.private/IN' denied
11-Aug-2007 18:41:35.121 client 192.168.100.3#5353: update 'domain.private/IN' denied
11-Aug-2007 18:41:35.151 client 192.168.100.3#5353: update 'domain.private/IN' denied
11-Aug-2007 19:15:56.134 shutting down
11-Aug-2007 19:15:56.134 stopping command channel on 127.0.0.1#54
11-Aug-2007 19:15:56.135 no longer listening on 127.0.0.1#53
11-Aug-2007 19:15:56.135 no longer listening on 192.168.100.2#53
11-Aug-2007 19:15:56.136 exiting
11-Aug-2007 19:17:15.570 named.local:11: ignoring out-of-zone data (1.localhost)
11-Aug-2007 19:17:15.570 zone 0.0.127.in-addr.arpa/IN: loaded serial 2007081140
11-Aug-2007 19:17:15.571 zone 100.168.192.in-addr.arpa/IN: loaded serial 2007081100
11-Aug-2007 19:17:15.571 zone localhost/IN: loaded serial 42
11-Aug-2007 19:17:15.573 zone domain.private/IN: loaded serial 2007081138
11-Aug-2007 19:17:15.573 running
11-Aug-2007 19:19:29.052 client 192.168.100.3#49947: transfer of 'domain.private/IN': AXFR-style IXFR started
11-Aug-2007 19:19:29.052 client 192.168.100.3#49947: transfer of 'domain.private/IN': AXFR-style IXFR ended
11-Aug-2007 20:14:06.700 shutting down
11-Aug-2007 20:14:06.700 stopping command channel on 127.0.0.1#54
11-Aug-2007 20:14:06.700 no longer listening on 127.0.0.1#53
11-Aug-2007 20:14:06.700 no longer listening on 192.168.100.2#53
11-Aug-2007 20:14:06.701 exiting
11-Aug-2007 20:14:47.039 named.local:11: ignoring out-of-zone data (1.localhost)
11-Aug-2007 20:14:47.194 zone 0.0.127.in-addr.arpa/IN: loaded serial 2007081140
11-Aug-2007 20:14:47.499 zone 100.168.192.in-addr.arpa/IN: loaded serial 2007081100
11-Aug-2007 20:14:47.500 zone localhost/IN: loaded serial 42
11-Aug-2007 20:14:47.540 zone domain.private/IN: loaded serial 2007081138
11-Aug-2007 20:14:47.540 running
11-Aug-2007 20:14:54.329 loading configuration from '/private/etc/named.conf'
11-Aug-2007 20:14:54.830 loading configuration from '/private/etc/named.conf'
11-Aug-2007 20:14:54.830 listening on IPv4 interface en0, 192.168.100.2#53
11-Aug-2007 20:14:56.723 loading configuration from '/private/etc/named.conf'
11-Aug-2007 20:15:00.407 client 192.168.100.2#5353: update 'domain.private/IN' denied
11-Aug-2007 20:15:00.438 client 192.168.100.2#5353: update 'domain.private/IN' denied
11-Aug-2007 20:17:19.602 client 192.168.100.3#5353: update 'domain.private/IN' denied
11-Aug-2007 20:17:19.632 client 192.168.100.3#5353: update 'domain.private/IN' denied
11-Aug-2007 20:46:30.988 shutting down
11-Aug-2007 20:46:30.988 stopping command channel on 127.0.0.1#54
11-Aug-2007 20:46:30.989 no longer listening on 127.0.0.1#53
11-Aug-2007 20:46:30.989 no longer listening on 192.168.100.2#53
11-Aug-2007 20:46:30.991 exiting
11-Aug-2007 20:48:54.163 named.local:11: ignoring out-of-zone data (1.localhost)
11-Aug-2007 20:48:54.350 zone 0.0.127.in-addr.arpa/IN: loaded serial 2007081140
11-Aug-2007 20:48:54.352 zone 100.168.192.in-addr.arpa/IN: loaded serial 2007081100
11-Aug-2007 20:48:54.353 zone localhost/IN: loaded serial 42
11-Aug-2007 20:48:54.361 zone domain.private/IN: loaded serial 2007081138
11-Aug-2007 20:48:54.361 running
11-Aug-2007 20:49:00.573 loading configuration from '/private/etc/named.conf'
11-Aug-2007 20:49:01.076 loading configuration from '/private/etc/named.conf'
11-Aug-2007 20:49:01.078 listening on IPv4 interface en0, 192.168.100.2#53
11-Aug-2007 20:49:03.169 loading configuration from '/private/etc/named.conf'
11-Aug-2007 20:49:06.827 client 192.168.100.2#5353: update 'domain.private/IN' denied
11-Aug-2007 20:49:06.857 client 192.168.100.2#5353: update 'domain.private/IN' denied
11-Aug-2007 20:51:18.649 client 192.168.100.3#5353: update 'domain.private/IN' denied
11-Aug-2007 20:51:18.679 client 192.168.100.3#5353: update 'domain.private/IN' denied
12-Aug-2007 08:00:54.001 client 192.168.100.3#5353: update 'domain.private/IN' denied
12-Aug-2007 08:00:54.031 client 192.168.100.3#5353: update 'domain.private/IN' denied

I have tried through shut down of the DNS service and turn on to get the network faster running.
But it helped only for 30 minutes.

Has someone an idea to solve this problem?
Thanks!

XServer G5 1x2 GHz, XServer G5 2x2.3 GHz, Mac OS X (10.4.10), Network with Mac and Windows Client

Posted on Aug 12, 2007 3:00 AM

Reply
2 replies

Aug 12, 2007 6:00 AM in response to XMacKem

"en0/4" is this some kind of multiport card? Does it have link on that port (is it connected to the/any network?

You have the Firewall running on all server machines behind the (NAT-) router?

Do you want need mDNS (Bonjour) running to find the servers?
Then you probably need to open for mDNS multicast traffic (denied by default when you turn on the firewall in the advanced rules - just untick those 224.0.0.x rules)


"named.local:11: ignoring out-of-zone data (1.localhost)"
last row of /var/named.local
1 IN PTR localhost.
Should probably be:
127.0.0.1 IN PTR localhost.
to not get that error.


What is slow? Network traffic or DNS lookups or what?


To speed up DNS lookups enter ISP DNS as forwarders in /etc/named.conf and maybe turn off IPv6 on alla machines.

Aug 12, 2007 6:35 AM in response to Leif Carlsson

"en0/4" is the ethernet card with two ethernet ports on our Xserver.
en0 is port 1 and en1 is port 2, but not used.
The "/4" mean IPv4, I think so but I am not sure.

We have turned on the firewall to control which computer can get into the internet and has email service. The rooter is not managed by us it is managed by our internet provider.

Do you mean the port 5353 by the mDNS multicast traffic. The port 5353 is open
for all of our computer within our domain.
What do you mean with untick 224.0.0.x rules.
In firewall settings advanced we have the following settings active:
"deny 224.0.0.0/4 any in"
"deny any 224.0.0.0/4 in"

I had turned off the firewalls on all Xservers for two days ago, but it didn't
help to solve the problem with the message:
"mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 718456374"

With slow I mean the network traffic, mail service, internet and the login into
the user accounts. The network is slow since I get the messages:
"mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 01816400 en0/4 to 224.0.0.251:5353 skt 9 error -1 errno 65 (No route to host) 718456374",
"dashboardadivsoryd[5891]: fetch-parsers: unable to fetch data from read stream" and
"dashboardadivsoryd[5891]: fetch: unable to fetch data from read stream while fetch advisory list"

What do you mean with ISP DNS?
In our named.conf, the forwarder is the IP rooter address.

Thanks for your help!

mDNSPlatformSendUDP Error, slowly Network

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