2008 SBS and DNS. Has it gone mental?
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From: Freaky on 29 Apr 2010 09:22 Hi there, quite some time ago we had weird issues with a 2008 SBS server at a customer several times. The issue was that it was not possible to send e-mail to SOME domains. After investigating it turned out the 2008 SBS' DNS server returned no records for MX or A lookups on the domain. The DNS server had no forwarders configured and apparently cached no or incorrect responses. AFAIK it's NOT allowed to cache such responses. I'm lead to this conclusion because after several hours at the customer, requesting the records through a workstation or on the command line of the server itself, still returned nothing. Today I have the same issue at our own network. www.bbc.co.uk doesn't exist according to our 2008 SBS server. Currently I'm on my linux laptop, as I like the 'dig' utility much better for troubleshooting DNS than nslookup. This is the response: freaky(a)flaptoppy ~ $ dig www.bbc.co.uk ; <<>> DiG 9.6.1-P3 <<>> www.bbc.co.uk ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 17171 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.bbc.co.uk. IN A ;; Query time: 0 msec ;; SERVER: 10.20.30.1#53(10.20.30.1) ;; WHEN: Thu Apr 29 15:18:29 2010 ;; MSG SIZE rcvd: 31 The 10.20.30.1 is our SBS 2008 server. It's the only DNS server that is passed out by the DHCP server. Using another DNS server, for example google's public DNS server easily proves the records do exist: freaky(a)flaptoppy ~ $ dig @8.8.8.8 www.bbc.co.uk ; <<>> DiG 9.6.1-P3 <<>> @8.8.8.8 www.bbc.co.uk ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57542 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.bbc.co.uk. IN A ;; ANSWER SECTION: www.bbc.co.uk. 290 IN CNAME www.bbc.net.uk. www.bbc.net.uk. 287 IN A 212.58.246.160 ;; Query time: 9 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Thu Apr 29 15:19:25 2010 ;; MSG SIZE rcvd: 73 Yet our server still can't resolve it. No errors in the logs... Nothing of use... I need to be able to trust something as essential as a DNS service. Once this error occurs the only way to get DNS for that domain working again is either flushing the DNS servers cache, or restarting it (which oc flushes the cache as well). This is not a desirable solution at all. Anyone know what's going wrong and why the hell it caches a 'no response' or 'invalid' record? I think we can all agree www.bbc.co.uk hasn't been down and since I'm sure the domains my customer didn't had issues with weren't down, the problem must be with the DNS service. TIA & kind regards
From: Freaky on 29 Apr 2010 09:55 Apparently it's a know issue: http://support.microsoft.com/kb/968372 It is however very unclear to me whether the solution they propose is an actual *solution* or just a work-around that makes it less likely to occur (since only a time-out is increased I tend to believe the latter). DNS is pretty essential... Already had to explain a customer on 3 different occasions why their server didn't send mail out to certain domains, and they won't be this understanding next time (in all honesty, they weren't very understanding concerning this issue to begin with...). Anyone have experience with the 'solution' provided by MS? TIA On 29-04-10 15:22, Freaky wrote: > Hi there, > > quite some time ago we had weird issues with a 2008 SBS server at a > customer several times. The issue was that it was not possible to send > e-mail to SOME domains. > > After investigating it turned out the 2008 SBS' DNS server returned no > records for MX or A lookups on the domain. The DNS server had no > forwarders configured and apparently cached no or incorrect responses. > AFAIK it's NOT allowed to cache such responses. I'm lead to this > conclusion because after several hours at the customer, requesting the > records through a workstation or on the command line of the server > itself, still returned nothing. > > Today I have the same issue at our own network. www.bbc.co.uk doesn't > exist according to our 2008 SBS server. Currently I'm on my linux > laptop, as I like the 'dig' utility much better for troubleshooting DNS > than nslookup. > > This is the response: > > freaky(a)flaptoppy ~ $ dig www.bbc.co.uk > > ; <<>> DiG 9.6.1-P3 <<>> www.bbc.co.uk > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 17171 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 > > ;; QUESTION SECTION: > ;www.bbc.co.uk. IN A > > ;; Query time: 0 msec > ;; SERVER: 10.20.30.1#53(10.20.30.1) > ;; WHEN: Thu Apr 29 15:18:29 2010 > ;; MSG SIZE rcvd: 31 > > > The 10.20.30.1 is our SBS 2008 server. It's the only DNS server that is > passed out by the DHCP server. > > Using another DNS server, for example google's public DNS server easily > proves the records do exist: > > freaky(a)flaptoppy ~ $ dig @8.8.8.8 www.bbc.co.uk > > ; <<>> DiG 9.6.1-P3 <<>> @8.8.8.8 www.bbc.co.uk > ; (1 server found) > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57542 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 > > ;; QUESTION SECTION: > ;www.bbc.co.uk. IN A > > ;; ANSWER SECTION: > www.bbc.co.uk. 290 IN CNAME www.bbc.net.uk. > www.bbc.net.uk. 287 IN A 212.58.246.160 > > ;; Query time: 9 msec > ;; SERVER: 8.8.8.8#53(8.8.8.8) > ;; WHEN: Thu Apr 29 15:19:25 2010 > ;; MSG SIZE rcvd: 73 > > > Yet our server still can't resolve it. No errors in the logs... Nothing > of use... I need to be able to trust something as essential as a DNS > service. Once this error occurs the only way to get DNS for that domain > working again is either flushing the DNS servers cache, or restarting it > (which oc flushes the cache as well). This is not a desirable solution > at all. > > Anyone know what's going wrong and why the hell it caches a 'no > response' or 'invalid' record? I think we can all agree www.bbc.co.uk > hasn't been down and since I'm sure the domains my customer didn't had > issues with weren't down, the problem must be with the DNS service. > > TIA & kind regards
From: Cris Hanna [SBS - MVP] on 29 Apr 2010 10:33 Yes it works, if you're using Root Hints for DNS resolution You could trying switching to DNS Forwarders and set that up to point to OpenDNS I was thinking this setting got modified in one of the SBS Update Rollups Do you have Update Rollup 3 installed? -- Cris Hanna [SBS - MVP] (since 1997) Co-Contributor, Windows Small Business Server 2008 Unleashed http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1 Owner, CPU Services, Belleville, IL A Microsoft Registered Partner ------------------------------------ MVPs do not work for Microsoft Please do not submit questions directly to me. "Freaky" <wontsay(a)ondeja.com> wrote in message news:ej$ZfO65KHA.1888(a)TK2MSFTNGP05.phx.gbl... Apparently it's a know issue: http://support.microsoft.com/kb/968372 It is however very unclear to me whether the solution they propose is an actual *solution* or just a work-around that makes it less likely to occur (since only a time-out is increased I tend to believe the latter). DNS is pretty essential... Already had to explain a customer on 3 different occasions why their server didn't send mail out to certain domains, and they won't be this understanding next time (in all honesty, they weren't very understanding concerning this issue to begin with...). Anyone have experience with the 'solution' provided by MS? TIA On 29-04-10 15:22, Freaky wrote: > Hi there, > > quite some time ago we had weird issues with a 2008 SBS server at a > customer several times. The issue was that it was not possible to send > e-mail to SOME domains. > > After investigating it turned out the 2008 SBS' DNS server returned no > records for MX or A lookups on the domain. The DNS server had no > forwarders configured and apparently cached no or incorrect responses. > AFAIK it's NOT allowed to cache such responses. I'm lead to this > conclusion because after several hours at the customer, requesting the > records through a workstation or on the command line of the server > itself, still returned nothing. > > Today I have the same issue at our own network. www.bbc.co.uk doesn't > exist according to our 2008 SBS server. Currently I'm on my linux > laptop, as I like the 'dig' utility much better for troubleshooting DNS > than nslookup. > > This is the response: > > freaky(a)flaptoppy ~ $ dig www.bbc.co.uk > > ; <<>> DiG 9.6.1-P3 <<>> www.bbc.co.uk > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 17171 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 > > ;; QUESTION SECTION: > ;www.bbc.co.uk. IN A > > ;; Query time: 0 msec > ;; SERVER: 10.20.30.1#53(10.20.30.1) > ;; WHEN: Thu Apr 29 15:18:29 2010 > ;; MSG SIZE rcvd: 31 > > > The 10.20.30.1 is our SBS 2008 server. It's the only DNS server that is > passed out by the DHCP server. > > Using another DNS server, for example google's public DNS server easily > proves the records do exist: > > freaky(a)flaptoppy ~ $ dig @8.8.8.8 www.bbc.co.uk > > ; <<>> DiG 9.6.1-P3 <<>> @8.8.8.8 www.bbc.co.uk > ; (1 server found) > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57542 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 > > ;; QUESTION SECTION: > ;www.bbc.co.uk. IN A > > ;; ANSWER SECTION: > www.bbc.co.uk. 290 IN CNAME www.bbc.net.uk. > www.bbc.net.uk. 287 IN A 212.58.246.160 > > ;; Query time: 9 msec > ;; SERVER: 8.8.8.8#53(8.8.8.8) > ;; WHEN: Thu Apr 29 15:19:25 2010 > ;; MSG SIZE rcvd: 73 > > > Yet our server still can't resolve it. No errors in the logs... Nothing > of use... I need to be able to trust something as essential as a DNS > service. Once this error occurs the only way to get DNS for that domain > working again is either flushing the DNS servers cache, or restarting it > (which oc flushes the cache as well). This is not a desirable solution > at all. > > Anyone know what's going wrong and why the hell it caches a 'no > response' or 'invalid' record? I think we can all agree www.bbc.co.uk > hasn't been down and since I'm sure the domains my customer didn't had > issues with weren't down, the problem must be with the DNS service. > > TIA & kind regards
From: Freaky on 29 Apr 2010 10:54 Hi Cris, if it comes with the microsoftupdate tool, it's installed, otherwise I'd have to check. All essential updates from microsoftupdate have been installed. Can't use forwarders. The reasons we use root hints is that there are 2 internetlines in fail-over / loadbalancing. For the 2008 server (or well, basically any OS as the router handles it) it's not possible to know over what line (and thus what forwarder) it goes out. They are purposely from different ISP (and even different infrastructure suppliers), so the risk of them both failing at the same time is minimized as much as possible. Public DNS servers usually come with their own issues. At least, there are quite the amount of warnings on the internet of them having issues with RBL's like zen.spamhaus.org due to not honoring certain cache settings and/or the DNS server at the RBL limiting requests per time unit from a host. Next to that, iirc, opendns always returns IPs even if there are no A records to point you to ad pages, which is how they survive. That causes undesirable results as well. Anyways, thanks for the re' :). Kind regards On 29-04-10 16:33, Cris Hanna [SBS - MVP] wrote: > Yes it works, if you're using Root Hints for DNS resolution > You could trying switching to DNS Forwarders and set that up to point to > OpenDNS > I was thinking this setting got modified in one of the SBS Update > Rollups Do you have Update Rollup 3 installed? > > > -- > Cris Hanna [SBS - MVP] (since 1997) > Co-Contributor, Windows Small Business Server 2008 Unleashed > http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1 > <http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1> > Owner, CPU Services, Belleville, IL > A Microsoft Registered Partner > ------------------------------------ > MVPs do not work for Microsoft > Please do not submit questions directly to me. > > "Freaky" <wontsay(a)ondeja.com <mailto:wontsay(a)ondeja.com>> wrote in > message news:ej$ZfO65KHA.1888(a)TK2MSFTNGP05.phx.gbl... > Apparently it's a know issue: > > http://support.microsoft.com/kb/968372 > > It is however very unclear to me whether the solution they propose is an > actual *solution* or just a work-around that makes it less likely to > occur (since only a time-out is increased I tend to believe the latter). > > DNS is pretty essential... Already had to explain a customer on 3 > different occasions why their server didn't send mail out to certain > domains, and they won't be this understanding next time (in all honesty, > they weren't very understanding concerning this issue to begin with...). > > Anyone have experience with the 'solution' provided by MS? > > TIA > > On 29-04-10 15:22, Freaky wrote: > > Hi there, > > > > quite some time ago we had weird issues with a 2008 SBS server at a > > customer several times. The issue was that it was not possible to send > > e-mail to SOME domains. > > > > After investigating it turned out the 2008 SBS' DNS server returned no > > records for MX or A lookups on the domain. The DNS server had no > > forwarders configured and apparently cached no or incorrect responses. > > AFAIK it's NOT allowed to cache such responses. I'm lead to this > > conclusion because after several hours at the customer, requesting the > > records through a workstation or on the command line of the server > > itself, still returned nothing. > > > > Today I have the same issue at our own network. www.bbc.co.uk > <http://www.bbc.co.uk> doesn't > > exist according to our 2008 SBS server. Currently I'm on my linux > > laptop, as I like the 'dig' utility much better for > troubleshooting DNS > > than nslookup. > > > > This is the response: > > > > freaky(a)flaptoppy <mailto:freaky(a)flaptoppy> ~ $ dig www.bbc.co.uk > <http://www.bbc.co.uk> > > > > ; <<>> DiG 9.6.1-P3 <<>> www.bbc.co.uk <http://www.bbc.co.uk> > > ;; global options: +cmd > > ;; Got answer: > > ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 17171 > > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 > > > > ;; QUESTION SECTION: > > ;www.bbc.co.uk. IN A > > > > ;; Query time: 0 msec > > ;; SERVER: 10.20.30.1#53(10.20.30.1) > > ;; WHEN: Thu Apr 29 15:18:29 2010 > > ;; MSG SIZE rcvd: 31 > > > > > > The 10.20.30.1 is our SBS 2008 server. It's the only DNS server > that is > > passed out by the DHCP server. > > > > Using another DNS server, for example google's public DNS server > easily > > proves the records do exist: > > > > freaky(a)flaptoppy <mailto:freaky(a)flaptoppy> ~ $ dig @8.8.8.8 > www.bbc.co.uk <http://www.bbc.co.uk> > > > > ; <<>> DiG 9.6.1-P3 <<>> @8.8.8.8 www.bbc.co.uk <http://www.bbc.co.uk> > > ; (1 server found) > > ;; global options: +cmd > > ;; Got answer: > > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57542 > > ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 > > > > ;; QUESTION SECTION: > > ;www.bbc.co.uk. IN A > > > > ;; ANSWER SECTION: > > www.bbc.co.uk <http://www.bbc.co.uk>. 290 IN CNAME www.bbc.net.uk > <http://www.bbc.net.uk>. > > www.bbc.net.uk <http://www.bbc.net.uk>. 287 IN A 212.58.246.160 > > > > ;; Query time: 9 msec > > ;; SERVER: 8.8.8.8#53(8.8.8.8) > > ;; WHEN: Thu Apr 29 15:19:25 2010 > > ;; MSG SIZE rcvd: 73 > > > > > > Yet our server still can't resolve it. No errors in the logs... > Nothing > > of use... I need to be able to trust something as essential as a DNS > > service. Once this error occurs the only way to get DNS for that > domain > > working again is either flushing the DNS servers cache, or > restarting it > > (which oc flushes the cache as well). This is not a desirable solution > > at all. > > > > Anyone know what's going wrong and why the hell it caches a 'no > > response' or 'invalid' record? I think we can all agree > www.bbc.co.uk <http://www.bbc.co.uk> > > hasn't been down and since I'm sure the domains my customer didn't had > > issues with weren't down, the problem must be with the DNS service. > > > > TIA & kind regards
From: Cris Hanna [SBS - MVP] on 29 Apr 2010 12:09 The DNS forwarders would be entered on your internal DNS, so no matter which interface is used, it still uses OpenDNS DNS servers, which do not have the issues as the ISP DNS servers you mentioned You can either enter DNS forwarders during the Connect to the Internet wizard or you can manually add them in the DNS snap in on your SBS server The latest Update Rollup - UR 4 is now available here http://catalog.update.microsoft.com/v7/site/Install.aspx?q=KB979454&referringpage=Search.aspx -- Cris Hanna [SBS - MVP] (since 1997) Co-Contributor, Windows Small Business Server 2008 Unleashed http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1 Owner, CPU Services, Belleville, IL A Microsoft Registered Partner ------------------------------------ MVPs do not work for Microsoft Please do not submit questions directly to me. "Freaky" <wontsay(a)ondeja.com> wrote in message news:%23rO9ev65KHA.5016(a)TK2MSFTNGP02.phx.gbl... Hi Cris, if it comes with the microsoftupdate tool, it's installed, otherwise I'd have to check. All essential updates from microsoftupdate have been installed. Can't use forwarders. The reasons we use root hints is that there are 2 internetlines in fail-over / loadbalancing. For the 2008 server (or well, basically any OS as the router handles it) it's not possible to know over what line (and thus what forwarder) it goes out. They are purposely from different ISP (and even different infrastructure suppliers), so the risk of them both failing at the same time is minimized as much as possible. Public DNS servers usually come with their own issues. At least, there are quite the amount of warnings on the internet of them having issues with RBL's like zen.spamhaus.org due to not honoring certain cache settings and/or the DNS server at the RBL limiting requests per time unit from a host. Next to that, iirc, opendns always returns IPs even if there are no A records to point you to ad pages, which is how they survive. That causes undesirable results as well. Anyways, thanks for the re' :). Kind regards On 29-04-10 16:33, Cris Hanna [SBS - MVP] wrote: > Yes it works, if you're using Root Hints for DNS resolution > You could trying switching to DNS Forwarders and set that up to point to > OpenDNS > I was thinking this setting got modified in one of the SBS Update > Rollups Do you have Update Rollup 3 installed? > > > -- > Cris Hanna [SBS - MVP] (since 1997) > Co-Contributor, Windows Small Business Server 2008 Unleashed > http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1 > <http://www.amazon.com/Windows-Small-Business-Server-Unleashed/dp/0672329573/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1217269967&sr=8-1> > Owner, CPU Services, Belleville, IL > A Microsoft Registered Partner > ------------------------------------ > MVPs do not work for Microsoft > Please do not submit questions directly to me. > > "Freaky" <wontsay(a)ondeja.com <mailto:wontsay(a)ondeja.com>> wrote in > message news:ej$ZfO65KHA.1888(a)TK2MSFTNGP05.phx.gbl... > Apparently it's a know issue: > > http://support.microsoft.com/kb/968372 > > It is however very unclear to me whether the solution they propose is an > actual *solution* or just a work-around that makes it less likely to > occur (since only a time-out is increased I tend to believe the latter). > > DNS is pretty essential... Already had to explain a customer on 3 > different occasions why their server didn't send mail out to certain > domains, and they won't be this understanding next time (in all honesty, > they weren't very understanding concerning this issue to begin with...). > > Anyone have experience with the 'solution' provided by MS? > > TIA > > On 29-04-10 15:22, Freaky wrote: > > Hi there, > > > > quite some time ago we had weird issues with a 2008 SBS server at a > > customer several times. The issue was that it was not possible to send > > e-mail to SOME domains. > > > > After investigating it turned out the 2008 SBS' DNS server returned no > > records for MX or A lookups on the domain. The DNS server had no > > forwarders configured and apparently cached no or incorrect responses. > > AFAIK it's NOT allowed to cache such responses. I'm lead to this > > conclusion because after several hours at the customer, requesting the > > records through a workstation or on the command line of the server > > itself, still returned nothing. > > > > Today I have the same issue at our own network. www.bbc.co.uk > <http://www.bbc.co.uk> doesn't > > exist according to our 2008 SBS server. Currently I'm on my linux > > laptop, as I like the 'dig' utility much better for > troubleshooting DNS > > than nslookup. > > > > This is the response: > > > > freaky(a)flaptoppy <mailto:freaky(a)flaptoppy> ~ $ dig www.bbc.co.uk > <http://www.bbc.co.uk> > > > > ; <<>> DiG 9.6.1-P3 <<>> www.bbc.co.uk <http://www.bbc.co.uk> > > ;; global options: +cmd > > ;; Got answer: > > ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 17171 > > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 > > > > ;; QUESTION SECTION: > > ;www.bbc.co.uk. IN A > > > > ;; Query time: 0 msec > > ;; SERVER: 10.20.30.1#53(10.20.30.1) > > ;; WHEN: Thu Apr 29 15:18:29 2010 > > ;; MSG SIZE rcvd: 31 > > > > > > The 10.20.30.1 is our SBS 2008 server. It's the only DNS server > that is > > passed out by the DHCP server. > > > > Using another DNS server, for example google's public DNS server > easily > > proves the records do exist: > > > > freaky(a)flaptoppy <mailto:freaky(a)flaptoppy> ~ $ dig @8.8.8.8 > www.bbc.co.uk <http://www.bbc.co.uk> > > > > ; <<>> DiG 9.6.1-P3 <<>> @8.8.8.8 www.bbc.co.uk <http://www.bbc.co.uk> > > ; (1 server found) > > ;; global options: +cmd > > ;; Got answer: > > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57542 > > ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 > > > > ;; QUESTION SECTION: > > ;www.bbc.co.uk. IN A > > > > ;; ANSWER SECTION: > > www.bbc.co.uk <http://www.bbc.co.uk>. 290 IN CNAME www.bbc.net.uk > <http://www.bbc.net.uk>. > > www.bbc.net.uk <http://www.bbc.net.uk>. 287 IN A 212.58.246.160 > > > > ;; Query time: 9 msec > > ;; SERVER: 8.8.8.8#53(8.8.8.8) > > ;; WHEN: Thu Apr 29 15:19:25 2010 > > ;; MSG SIZE rcvd: 73 > > > > > > Yet our server still can't resolve it. No errors in the logs... > Nothing > > of use... I need to be able to trust something as essential as a DNS > > service. Once this error occurs the only way to get DNS for that > domain > > working again is either flushing the DNS servers cache, or > restarting it > > (which oc flushes the cache as well). This is not a desirable solution > > at all. > > > > Anyone know what's going wrong and why the hell it caches a 'no > > response' or 'invalid' record? I think we can all agree > www.bbc.co.uk <http://www.bbc.co.uk> > > hasn't been down and since I'm sure the domains my customer didn't had > > issues with weren't down, the problem must be with the DNS service. > > > > TIA & kind regards
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