I run a caching DNS server locally and it also serves up the domain for my house. Since I upgrade from Ubuntu 16.04 to Ubuntu 18.04 I started seeing a number of errors from named like this: 26-Aug-2018 08:05:21.536 general: error: ../../../../lib/isc/unix/socket.c:2135: unexpected error: 26-Aug-2018 08:05:21.537 general: error: internal_send: 192.168.42.11#44893: Invalid argument I have done some Google searching and haven't found a way to track down what these errors are about. The hosts giving the errors vary. I've turned on some more logging and gotten a little more information, but nothing that I know how to act on yet. 26-Aug-2018 08:05:21.537 client: warning: client @0x7ff70c596c10 192.168.42.11#44893 (hb.vntsm.com): error sending response: invalid file 26-Aug-2018 08:05:21.250 queries: info: client @0x7ff70c540460 192.168.42.11#60173 (pagead2.googlesyndication.com): query: pagead2.googlesyndication.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.250 queries: info: client @0x7ff704173710 192.168.42.11#40274 (pagead2.googlesyndication.com): query: pagead2.googlesyndication.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.251 queries: info: client @0x7ff7040a7c60 192.168.42.11#36745 (pagead2.googlesyndication.com): query: pagead2.googlesyndication.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.251 queries: info: client @0x7ff704184a70 192.168.42.11#40582 (pagead2.googlesyndication.com): query: pagead2.googlesyndication.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.285 queries: info: client @0x7ff70c56cd70 192.168.42.11#47198 (pagead46.l.doubleclick.net): query: pagead46.l.doubleclick.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.285 queries: info: client @0x7ff70c56cd70 192.168.42.11#51746 (pagead46.l.doubleclick.net): query: pagead46.l.doubleclick.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.286 queries: info: client @0x7ff70c56cd70 192.168.42.11#36190 (pagead46.l.doubleclick.net): query: pagead46.l.doubleclick.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.286 queries: info: client @0x7ff70c56cd70 192.168.42.11#42402 (pagead46.l.doubleclick.net): query: pagead46.l.doubleclick.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.311 queries: info: client @0x7ff70c56cd70 192.168.42.11#41938 (plus.addkt.com): query: plus.addkt.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.311 queries: info: client @0x7ff70c0c7a30 192.168.42.11#60195 (plus.addkt.com): query: plus.addkt.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.311 queries: info: client @0x7ff704193090 192.168.42.11#58893 (plus.addkt.com): query: plus.addkt.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.311 queries: info: client @0x7ff7041cc910 192.168.42.11#39746 (plus.addkt.com): query: plus.addkt.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.311 queries: info: client @0x7ff7041393d0 192.168.42.11#60316 (e4361.b.akamaiedge.net): query: e4361.b.akamaiedge.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.312 queries: info: client @0x7ff70404cdb0 192.168.42.11#54911 (e4361.b.akamaiedge.net): query: e4361.b.akamaiedge.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.312 queries: info: client @0x7ff7041afcd0 192.168.42.11#44802 (e4361.b.akamaiedge.net): query: e4361.b.akamaiedge.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.312 queries: info: client @0x7ff70c531e40 192.168.42.11#35079 (e4361.b.akamaiedge.net): query: e4361.b.akamaiedge.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.332 queries: info: client @0x7ff70c5c2a10 192.168.42.11#47927 (www.sc.pages02.net): query: www.sc.pages02.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.332 queries: info: client @0x7ff704039260 192.168.42.11#47780 (www.sc.pages02.net): query: www.sc.pages02.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.333 queries: info: client @0x7ff70c4e26c0 192.168.42.11#58163 (www.sc.pages02.net): query: www.sc.pages02.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.333 queries: info: client @0x7ff7041daf30 192.168.42.11#54035 (www.sc.pages02.net): query: www.sc.pages02.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.379 queries: info: client @0x7ff70c0d61c0 192.168.42.11#48247 (hb.vntsm.com): query: hb.vntsm.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.380 queries: info: client @0x7ff704139db0 192.168.42.11#56126 (hb.vntsm.com): query: hb.vntsm.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.380 queries: info: client @0x7ff70c596c10 192.168.42.11#44893 (hb.vntsm.com): query: hb.vntsm.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.380 queries: info: client @0x7ff70c5611b0 192.168.42.11#39366 (hb.vntsm.com): query: hb.vntsm.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.448 queries: info: client @0x7ff70c5d11a0 192.168.42.11#41999 (d3orxtnkvjklwn.cloudfront.net): query: d3orxtnkvjklwn.cloudfront.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.448 queries: info: client @0x7ff70c515910 192.168.42.11#39850 (d3orxtnkvjklwn.cloudfront.net): query: d3orxtnkvjklwn.cloudfront.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.449 queries: info: client @0x7ff7041a16b0 192.168.42.11#53190 (d3orxtnkvjklwn.cloudfront.net): query: d3orxtnkvjklwn.cloudfront.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.449 queries: info: client @0x7ff70c4f0ce0 192.168.42.11#33695 (d3orxtnkvjklwn.cloudfront.net): query: d3orxtnkvjklwn.cloudfront.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.459 queries: info: client @0x7ff704126230 192.168.42.11#42630 (vdna.exelator.com): query: vdna.exelator.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.459 queries: info: client @0x7ff7040c1b60 192.168.42.11#47304 (vdna.exelator.com): query: vdna.exelator.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.460 queries: info: client @0x7ff7040ec3e0 192.168.42.11#58112 (vdna.exelator.com): query: vdna.exelator.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.460 queries: info: client @0x7ff704097630 192.168.42.11#47490 (vdna.exelator.com): query: vdna.exelator.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.537 queries: info: client @0x7ff70c5a5230 192.168.42.11#39156 (hb-vntsm-com.venatusmedia.netdna-cdn.com): query: hb-vntsm-com.venatusmedia.netdna-cdn.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.538 queries: info: client @0x7ff70c5a5230 192.168.42.11#34684 (hb-vntsm-com.venatusmedia.netdna-cdn.com): query: hb-vntsm-com.venatusmedia.netdna-cdn.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.538 queries: info: client @0x7ff70c5a5230 192.168.42.11#59294 (hb-vntsm-com.venatusmedia.netdna-cdn.com): query: hb-vntsm-com.venatusmedia.netdna-cdn.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.574 queries: info: client @0x7ff70c5a5230 192.168.42.11#54660 (c.amazon-adsystem.com): query: c.amazon-adsystem.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.574 queries: info: client @0x7ff70c5b3e20 192.168.42.11#41715 (c.amazon-adsystem.com): query: c.amazon-adsystem.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.574 queries: info: client @0x7ff70c4f3b30 192.168.42.11#60820 (c.amazon-adsystem.com): query: c.amazon-adsystem.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.575 queries: info: client @0x7ff7041177b0 192.168.42.11#40229 (c.amazon-adsystem.com): query: c.amazon-adsystem.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.575 queries: info: client @0x7ff7041e9550 192.168.42.11#38456 (clarium.global.ssl.fastly.net): query: clarium.global.ssl.fastly.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.575 queries: info: client @0x7ff7040252e0 192.168.42.11#54735 (clarium.global.ssl.fastly.net): query: clarium.global.ssl.fastly.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.575 queries: info: client @0x7ff7040b3540 192.168.42.11#49875 (clarium.global.ssl.fastly.net): query: clarium.global.ssl.fastly.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.575 queries: info: client @0x7ff7040d0180 192.168.42.11#54386 (clarium.global.ssl.fastly.net): query: clarium.global.ssl.fastly.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.585 queries: info: client @0x7ff7040faa00 192.168.42.11#58569 (www-googletagmanager.l.google.com): query: www-googletagmanager.l.google.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.585 queries: info: client @0x7ff704134cb0 192.168.42.11#59063 (www-googletagmanager.l.google.com): query: www-googletagmanager.l.google.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.585 queries: info: client @0x7ff7041be2f0 192.168.42.11#57251 (www-googletagmanager.l.google.com): query: www-googletagmanager.l.google.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.585 queries: info: client @0x7ff70c5607d0 192.168.42.11#43717 (www-googletagmanager.l.google.com): query: www-googletagmanager.l.google.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.614 queries: info: client @0x7ff70408b8f0 192.168.42.11#33132 (load.txexp.exelator.com): query: load.txexp.exelator.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.614 queries: info: client @0x7ff70408b8f0 192.168.42.11#48695 (load.txexp.exelator.com): query: load.txexp.exelator.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.614 queries: info: client @0x7ff70408b8f0 192.168.42.11#34299 (load.txexp.exelator.com): query: load.txexp.exelator.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.614 queries: info: client @0x7ff70408b8f0 192.168.42.11#39615 (load.txexp.exelator.com): query: load.txexp.exelator.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.679 queries: info: client @0x7ff70408b8f0 192.168.42.11#52660 (d1ykf07e75w7ss.cloudfront.net): query: d1ykf07e75w7ss.cloudfront.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.679 queries: info: client @0x7ff70408b8f0 192.168.42.11#52206 (d1ykf07e75w7ss.cloudfront.net): query: d1ykf07e75w7ss.cloudfront.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.679 queries: info: client @0x7ff70408b8f0 192.168.42.11#55413 (d1ykf07e75w7ss.cloudfront.net): query: d1ykf07e75w7ss.cloudfront.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.733 queries: info: client @0x7ff70408b8f0 192.168.42.11#44447 (report-ads-to.pubnation.com): query: report-ads-to.pubnation.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.734 queries: info: client @0x7ff704173710 192.168.42.11#44132 (report-ads-to.pubnation.com): query: report-ads-to.pubnation.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.734 queries: info: client @0x7ff704184a70 192.168.42.11#46261 (report-ads-to.pubnation.com): query: report-ads-to.pubnation.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.734 queries: info: client @0x7ff70c540460 192.168.42.11#51723 (report-ads-to.pubnation.com): query: report-ads-to.pubnation.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.792 queries: info: client @0x7ff7040a7c60 192.168.42.11#37014 (avatar.amuniversal.com.cdngc.net): query: avatar.amuniversal.com.cdngc.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.793 queries: info: client @0x7ff7041393d0 192.168.42.11#33665 (avatar.amuniversal.com.cdngc.net): query: avatar.amuniversal.com.cdngc.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.793 queries: info: client @0x7ff7041afcd0 192.168.42.11#46550 (avatar.amuniversal.com.cdngc.net): query: avatar.amuniversal.com.cdngc.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.793 queries: info: client @0x7ff70c531e40 192.168.42.11#40597 (avatar.amuniversal.com.cdngc.net): query: avatar.amuniversal.com.cdngc.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.794 queries: info: client @0x7ff70404cdb0 192.168.42.11#54296 (assets.amuniversal.com): query: assets.amuniversal.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.795 queries: info: client @0x7ff70c4e26c0 192.168.42.11#34201 (assets.amuniversal.com): query: assets.amuniversal.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.795 queries: info: client @0x7ff70c5c2a10 192.168.42.11#40523 (assets.amuniversal.com): query: assets.amuniversal.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.795 queries: info: client @0x7ff704039260 192.168.42.11#55589 (assets.amuniversal.com): query: assets.amuniversal.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.795 queries: info: client @0x7ff7041daf30 192.168.42.11#49369 (assets.gocomics.com.cdngc.net): query: assets.gocomics.com.cdngc.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.795 queries: info: client @0x7ff70c0c7a30 192.168.42.11#33219 (assets.gocomics.com.cdngc.net): query: assets.gocomics.com.cdngc.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.795 queries: info: client @0x7ff70c56cd70 192.168.42.11#37351 (assets.gocomics.com.cdngc.net): query: assets.gocomics.com.cdngc.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.795 queries: info: client @0x7ff7041cc910 192.168.42.11#49678 (assets.gocomics.com.cdngc.net): query: assets.gocomics.com.cdngc.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.873 queries: info: client @0x7ff704193090 192.168.42.11#56864 (k.global-ssl.fastly.net): query: k.global-ssl.fastly.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.873 queries: info: client @0x7ff704193090 192.168.42.11#46936 (k.global-ssl.fastly.net): query: k.global-ssl.fastly.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.873 queries: info: client @0x7ff704193090 192.168.42.11#33037 (k.global-ssl.fastly.net): query: k.global-ssl.fastly.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.960 queries: info: client @0x7ff704193090 192.168.42.11#39741 (www.google-analytics.com): query: www.google-analytics.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.961 queries: info: client @0x7ff70c515910 192.168.42.11#58150 (www.google-analytics.com): query: www.google-analytics.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.961 queries: info: client @0x7ff70c4f0ce0 192.168.42.11#57626 (www-google-analytics.l.google.com): query: www-google-analytics.l.google.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.961 queries: info: client @0x7ff70c5d11a0 192.168.42.11#57588 (www-google-analytics.l.google.com): query: www-google-analytics.l.google.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.961 queries: info: client @0x7ff7041a16b0 192.168.42.11#59741 (www-google-analytics.l.google.com): query: www-google-analytics.l.google.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.961 queries: info: client @0x7ff704139db0 192.168.42.11#56377 (www-google-analytics.l.google.com): query: www-google-analytics.l.google.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.961 queries: info: client @0x7ff70c0d61c0 192.168.42.11#39579 (secure.quantserve.com): query: secure.quantserve.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.962 queries: info: client @0x7ff70c5611b0 192.168.42.11#39756 (secure.quantserve.com): query: secure.quantserve.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.962 queries: info: client @0x7ff70c596c10 192.168.42.11#41822 (secure.quantserve.com): query: secure.quantserve.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.962 queries: info: client @0x7ff7041e9550 192.168.42.11#48952 (secure.quantserve.com): query: secure.quantserve.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.962 queries: info: client @0x7ff7040d0180 192.168.42.11#43946 (dnn506yrbagrg.cloudfront.net): query: dnn506yrbagrg.cloudfront.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.962 queries: info: client @0x7ff7040c1b60 192.168.42.11#57924 (dnn506yrbagrg.cloudfront.net): query: dnn506yrbagrg.cloudfront.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.963 queries: info: client @0x7ff7040ec3e0 192.168.42.11#33294 (dnn506yrbagrg.cloudfront.net): query: dnn506yrbagrg.cloudfront.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.963 queries: info: client @0x7ff704126230 192.168.42.11#41709 (dnn506yrbagrg.cloudfront.net): query: dnn506yrbagrg.cloudfront.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.963 queries: info: client @0x7ff704097630 192.168.42.11#60298 (static.ads-twitter.com): query: static.ads-twitter.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.963 queries: info: client @0x7ff7040252e0 192.168.42.11#38937 (static.ads-twitter.com): query: static.ads-twitter.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.963 queries: info: client @0x7ff7040b3540 192.168.42.11#59166 (static.ads-twitter.com): query: static.ads-twitter.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.963 queries: info: client @0x7ff7040faa00 192.168.42.11#43127 (static.ads-twitter.com): query: static.ads-twitter.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.966 queries: info: client @0x7ff7041be2f0 192.168.42.11#57274 (e1879.e7.akamaiedge.net): query: e1879.e7.akamaiedge.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.966 queries: info: client @0x7ff704134cb0 192.168.42.11#44895 (e1879.e7.akamaiedge.net): query: e1879.e7.akamaiedge.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.966 queries: info: client @0x7ff70c5607d0 192.168.42.11#58870 (e1879.e7.akamaiedge.net): query: e1879.e7.akamaiedge.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.966 queries: info: client @0x7ff70c5b3e20 192.168.42.11#38321 (e1879.e7.akamaiedge.net): query: e1879.e7.akamaiedge.net IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.991 queries: info: client @0x7ff70c4f3b30 192.168.42.11#49226 (assets.gocomics.com.wtxcdn.com): query: assets.gocomics.com.wtxcdn.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.991 queries: info: client @0x7ff7041177b0 192.168.42.11#39575 (assets.gocomics.com.wtxcdn.com): query: assets.gocomics.com.wtxcdn.com IN A +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.991 queries: info: client @0x7ff7041177b0 192.168.42.11#36662 (assets.gocomics.com.wtxcdn.com): query: assets.gocomics.com.wtxcdn.com IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.999 queries: info: client @0x7ff70c5a5230 192.168.42.11#51383 (connect.facebook.net): query: connect.facebook.net IN AAAA +E(0) (192.168.42.2) 26-Aug-2018 08:05:21.999 queries: info: client @0x7ff70408b8f0 192.168.42.11#44309 (connect.facebook.net): query: connect.facebook.net IN A +E(0) (192.168.42.2) -- http://mtu.net/~jpschewe -------------- next part -------------- An HTML attachment was scrubbed... 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