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  • Resolving CloudFlare DNS related mail delivery problems

    - by Andy Castles
    I recently started using CloudFlare and am having a few teething problems. Our domain is netlanguages.com and while we have a lot of sub-domains listen, we are currently only trialling a few of the servers through the CloudFlare CDN (for example, www.netlanguages.com is enabled for CDN, netlanguages.com is not). The actual CDN service seems to be reliable, but the problem that we are having is with DNS, and specifically with mail delivery. The background is that we have contact forms on our web site which use PHP mail() to send the details to end-users' email addresses, with the "from" address of the messages being [email protected] which is a valid address on our mail server. Most of the mails are arriving correctly, but a few specific people are not receiving them. The webserver uses qmail to deliver the messages, and the qmail log files show us some of the errors that the receiving mail servers return when they reject the mail delivery attempt. Two examples: Connected to 94.100.176.20 but sender was rejected./Remote host said: 421 DNS problem (interdominios.netlanguages.com). Try again later Connected to 213.186.33.29 but sender was rejected./Remote host said: 451 DNS temporary failure (#4.3.0) From what I can tell, the receiving SMTP server is doing a DNS lookup of some description on either the host of the "from" email address (netlanguages.com) or the server name given in the EHLO command of the SMTP conversation (in the first example above, interdominios.netlanguages.com), both of which should resolve to non-CloudFlare IP addresses. I've read that the CloudFlare DNS service is very reliable and fast but both of the problems above seem to point to a problem with remote servers unable to do DNS lookups. I should also point out that we changed our DNS to CloudFlare on 6th Feb, and since then started experiencing these mail delivery problems. On 22nd Feb we moved our DNS away from CloudFlare to see if the issues were related to CloudFlare and after a few hours delivery began to work. Then on 26th Feb I moved the DNS back to CloudFlare again and delivery problems started again. The issues definitely seems to be related to DNS, but I don't know if it's a configuration issue, or something else. Finally, I should say that our two DNS MX records point to non-CDN A record IP addresses, interdominios.netlanguages.com (the web and qmail server) also points to a non-CDN A record IP address. Does anyone know what the problem could be here? Any light you can shed on this will be most appreciated. Many thanks, Andy

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  • How do you keep track of what's connected to your switches?

    - by Kamil Kisiel
    Currently we manually document the connections to the ports of our switches. Of course, maintenance is a chore, and the documentation is out of date as soon as you save it. Are there any tools for querying switches, preferably via SNMP, that can tell you what is connected on the other end? For the record, we use primarily HP ProCurve switches.

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  • IIS 502 error when using a CNAME

    - by jenocin
    I have a cname record to a dyndns address. This has worked fine in the past, but now if I use the cname error I get a 502 error from IIS 7. The dyndns address works fine and so does the actual ip address. Any ideas on what would cause this?

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  • DNS Problems (NIGHTMARES!) with BIND and Virtualmin

    - by Nyxynyx
    I have a webserver (Ubuntu 12.04 with LAMP) using Virtualmin / Webmin. Because I just moved from a Cpanel system, I am having a nightmare configuring the DNS! Using intoDNS.com, the failed reports are: Mismatched NS records WARNING: One or more of your nameservers did not return any of your NS records. DNS servers responded ERROR: One or more of your nameservers did not respond: The ones that did not respond are: 123.123.123.123 213.251.188.141x Multiple Nameservers ERROR: Looks like you have less than 2 nameservers. According to RFC2182 section 5 you must have at least 3 nameservers, and no more than 7. Having 2 nameservers is also ok by me. Missing nameservers reported by your nameserver You should already know that your NS records at your nameservers are missing, so here it is again: ns1.mydomain.com. sdns2.ovh.net. SOA record No valid SOA record came back! MX Records WWW A Record ERROR: I could not get any A records for www.mydomain.com! Step-by-Step of my Attempt In my domain registrar (Namecheap), I registered ns1.mydomain.com as a nameserver, pointing to the IP address of my web server which is running bind9. The domain is setup with DNS ns1.mydomain.com and sdns2.ovh.net. sdns2.ovh.net is a secondary DNS server (SLAVE and pointing mydomain.com to the IP address of my web server) Webserver domain: mydomain.com Webserver hostname: ns4000000.ip-123-123-123.net Webserver IP: 123.123.123.123 Under Virtualmin, I edited the default Virtual server template, BIND DNS records for new domains: ns1.mydomain.com Master DNS server hostname: ns1.mydomain.com Next I created a Virtual server using that server template. This is what I've done but its still not working! Any ideas? I've been stuck for days, thank you for all your help! service bind9 status * bind9 is running lsof -i :53 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME named 6966 bind 20u IPv6 338583 0t0 TCP *:domain (LISTEN) named 6966 bind 21u IPv4 338588 0t0 TCP localhost.localdomain:domain (LISTEN) named 6966 bind 22u IPv4 338590 0t0 TCP ns4000000.ip-123-123-123.net:domain (LISTEN) named 6966 bind 512u IPv6 338582 0t0 UDP *:domain named 6966 bind 513u IPv4 338587 0t0 UDP localhost.localdomain:domain named 6966 bind 514u IPv4 338589 0t0 UDP ns4000000.ip-123-123-123.net:domain /etc/resolv.con (Not sure how 213.186.33.99 got here) nameserver 127.0.0.1 nameserver 213.186.33.99 search ovh.net host 123.123.123.123 (my web server's IP) 13.60.245.198.in-addr.arpa domain name pointer ns4000000.ip-123-123-123.net. nslookup 213.186.33.99 Server: 127.0.0.1 Address: 127.0.0.1#53 Non-authoritative answer: 99.33.186.213.in-addr.arpa name = cdns.ovh.net. Authoritative answers can be found from: 33.186.213.in-addr.arpa nameserver = ns.ovh.net. 33.186.213.in-addr.arpa nameserver = dns.ovh.net. nslookup ns1.mydomain.com ;; Got SERVFAIL reply from 127.0.0.1, trying next server ;; connection timed out; no servers could be reached nslookup ns2.mydomain.com ;; Got SERVFAIL reply from 127.0.0.1, trying next server ;; connection timed out; no servers could be reached nslookup www.mydomain.com ;; Got SERVFAIL reply from 127.0.0.1, trying next server ;; connection timed out; no servers could be reached dig mydomain.com ; <<>> DiG 9.8.1-P1 <<>> mydomain.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 43540 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;mydomain.com. IN A ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Oct 11 11:30:09 2012 ;; MSG SIZE rcvd: 30 dig ns1.mydomain.com ; <<>> DiG 9.8.1-P1 <<>> ns1.mydomain.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 31254 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns1.mydomain.com. IN A ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Oct 11 11:30:16 2012 ;; MSG SIZE rcvd: 34 /etc/bind/named.conf include "/etc/bind/named.conf.options"; include "/etc/bind/named.conf.local"; include "/etc/bind/named.conf.default-zones"; /etc/bind/named.conf.default-zones zone "." { type hint; file "/etc/bind/db.root"; }; zone "localhost" { type master; file "/etc/bind/db.local"; }; zone "127.in-addr.arpa" { type master; file "/etc/bind/db.127"; }; zone "0.in-addr.arpa" { type master; file "/etc/bind/db.0"; }; zone "255.in-addr.arpa" { type master; file "/etc/bind/db.255"; }; /etc/bind/named.conf.local zone "mydomain.com" { type master; file "/var/lib/bind/mydomain.com.hosts"; allow-transfer { 127.0.0.1; localnets; }; }; /etc/bind/named.conf.options options { directory "/var/cache/bind"; dnssec-validation auto; auth-nxdomain no; # conform to RFC1035 listen-on-v6 { any; }; // allow-recursion { 127.0.0.1; }; // transfer-source; }; named-checkconf -z dns_master_load: /var/lib/bind/mydomain.com.hosts:21: unexpected end of line dns_master_load: /var/lib/bind/mydomain.com.hosts:20: unexpected end of input /var/lib/bind/mydomain.com.hosts: file does not end with newline zone mydomain.com/IN: loading from master file /var/lib/bind/mydomain.com.hosts failed: unexpected end of input zone mydomain.com/IN: not loaded due to errors. _default/mydomain.com/IN: unexpected end of input zone localhost/IN: loaded serial 2 zone 127.in-addr.arpa/IN: loaded serial 1 zone 0.in-addr.arpa/IN: loaded serial 1 zone 255.in-addr.arpa/IN: loaded serial 1 iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:20000 ACCEPT tcp -- anywhere anywhere tcp dpt:webmin ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:imaps ACCEPT tcp -- anywhere anywhere tcp dpt:imap2 ACCEPT tcp -- anywhere anywhere tcp dpt:pop3s ACCEPT tcp -- anywhere anywhere tcp dpt:pop3 ACCEPT tcp -- anywhere anywhere tcp dpt:ftp-data ACCEPT tcp -- anywhere anywhere tcp dpt:ftp ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:submission ACCEPT tcp -- anywhere anywhere tcp dpt:smtp ACCEPT tcp -- anywhere anywhere tcp dpt:ssh ACCEPT all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination

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  • Ubuntu 9.10: how do I troubleshoot a startup script that doesn't appear to run?

    - by TheDeeno
    I've created a bash script 'foo'. I've made that script executable with chmod+x and added it the the start-up by running sudo update-rc.d foo defaults 80 Despite that, it doesn't appear to be working at startup. Is there a way to have my script echo messages to a log? Or is there some log that would record events/errors for this? atm, I feel like I'm flying blind and don't really know how to troubleshoot this.

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  • Free, cross-platform screen recording utility

    - by abc
    I am looking for a screen recording (video) utility. Desired features are: It should be free (higher in priority) It should be available for Windows, Linux, and Mac (Mac in lower priority, Linux or Windows will work) It should have mic input facility to record external sound as well as machine's sound. It should have highlighting functionality (lower in priority)

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  • Is it possible to remove constant "beep" sound from recording?

    - by Darth
    Whenever I record with my microphone, I get this constant beep sound on the background. It appears only when I turn volume up, so it is not very loud, but its noticable and pretty annoying. Because it is constant sound, I thought it should be possible to filter just that one frequency, but I have absolutely no idea how to do it.

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  • How to implement custom domain feature like posterous?

    - by Weiwei
    here is how posterous works, I make a A record of DNS of my domain (blog.mydomainname.com) to posterous IP address 67.207.139.81 , in the manage panel of posterous , i put my custom domain (blog.meetingly.com). Then i can reach my posterous blog http://mydomainname.posterous.com from http://blog.mydomainname.com url. How posterous implements this? Is this a DNS level thing or web server level setting? Thanks a lot!

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  • Remove key from known_hosts

    - by Adam Matan
    Hi, I have built several virtual machines during the last few weeks. The problem is, the .ssh/known_hosts gives me the Man in the middle warning. This happens because another fingerprint is associated with the virtual machine IP. In the .ssh/known_hosts file, however, I don't seem to find the record related to the IP, only two bizarre, key-like strings and "ssh-rsa". Any ideas how to remove the old key from known_hosts? Thanks, Udi

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  • Forcing authentication for local domains

    - by Taron Sargsyan
    Today I mentioned strange issue on my ispconfig 3 installation. After some debugging it was clear that anyone can send emails to local domains without authentication. I checked main.cf and sow that smtp_senders_restriction pointing to mail_access table in ispconfig database. The issue is that table is empty and I'm not sure how to add record there through ispconfig interface. Any thoughts?? Thanks in advance.

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  • Domain clients can't reach website with same name as domain

    - by Moses
    I know this is a very basic question but I need some help. I'm setting up a domain controller on Zentyal with the domain name example.com. But I need the domain users to be able to get to our company website with the same name (http://example.com) that's hosted out there on a third party's server. I know this has something to do with adding a DNS record, but I don't know what type. I would experiment, but I don't want to break the whole works!

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  • Windows keyboard macro playback software?

    - by WilliamKF
    Many years ago, I had a product called Quickeys for the Macintosh that allowed me to record keyboard and mouse events and create a macro that could be assigned to a keyboard accelerator. This was a really useful tool, but I haven't seen anything like it ever on Microsoft Windows OS platform. Does such a product exist?

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  • Terminal server for Linux

    - by Hubert Kario
    What are the features of graphical terminal servers and technologies available for Linux? is it open source/free how well does it scale management (?) what's the network usage, susceptibility to latency support for session pause/resume what client platforms does it support support for sound (playback and record) directory/local disk sharing local printing other cons/pros This question is supposed to be a community wiki for comparison between the different technologies, but it looks like I don't have enough points to make questions into wikis(?)

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  • Ripping sound from online video ?

    - by Tal Galili
    Hi all, I wish to take Hello There are a couple of videos on the Web whose soundtracks I'd like to rip so I can listen to them while walking. What webapps/applications (for Windows), free or affordable, are there that will let me record whatever is being played? (That is following this SO thread that didn't get many replies) Thanks! Tal

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  • Why does my mail get marked as spam?

    - by schoen
    I Have the server "afspraakmanager.be". It matches everything not to be a spam server.(it isn't by the way): it has reverse dns, spf,dkim,... . But hotmail marks it as spam. I think the problem is the SPF/DKIM records. when i sent an email to my gmail it says: "Received-SPF: neutral (google.com: 2a02:348:8e:6048::1 is neither permitted nor denied by best guess record for domain of [email protected]) client-ip=2a02:348:8e:6048::1; Authentication-Results: mx.google.com; spf=neutral (google.com: 2a02:348:8e:6048::1 is neither permitted nor denied by best guess record for domain of [email protected]) [email protected]; dkim=neutral (bad format) [email protected]" So i guess my SPF and DKIM records aren't set up right. But I also don't have a clue what is wrong with them. this is the zone file: ; zone file for afspraakmanager.be $ORIGIN afspraakmanager.be. $TTL 3600 @ 86400 IN SOA ns1.eurodns.com. hostmaster.eurodns.com. ( 2013102003 ; serial 86400 ; refresh 7200 ; retry 604800 ; expire 86400 ; minimum ) @ 86400 IN NS ns1.eurodns.com. @ 86400 IN NS ns2.eurodns.com. @ 86400 IN NS ns3.eurodns.com. @ 86400 IN NS ns4.eurodns.com. ; Mail Exchanger definition @ 600 IN MX 10 smtp ; IPv4 Address definition @ IN A 37.230.96.72 afspraakmanager.be 600 IN A 37.230.96.72 localhost 86400 IN A 127.0.0.1 smtp 600 IN A 37.230.96.72 www 600 IN A 37.230.96.72 ; Text definition default._domainkey 600 IN TXT "v=DKIM1\\; k=rsa\\; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC6pvlZKnbSVXg1Bf3MF2l8xRrKPmqIw2i9Rn1yZ3HEny9qH1vyGXUjdv2O0aQbd5YShSGjtg5H/GedRMLpB0Qb+hBj1yGofOQTdcVtZZfj8qBY5Z7vEkhvtdaogQ0vLjgcwhg0BBuTewEkLxrl9IIzkPMZ1SCtM2Y0RtiUhg2cjQIDAQAB" ; Sender Policy Framework definition afspraakmanager.be 600 IN SPF "v=spf1 a mx ptr +all" The DKIM signature in the header: DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=afspraakmanager.be; s=mail; t=1382361029; bh=4pDpXBY8rCbX8+MfrklZzpQxaUsa3vSPUYjcDR3KAnU=; h=Date:From:To:Subject:From; b=SoBBaAlrueD8qID8txl2SBSqnZgN2lkPCdSPI/m7/YLezIcBedkgIX1NswYiZFl6Z AmF8dES73WUaaJjItVHSrdCJK2mJ/Az+vrgNsyk+GqZZ1YPiIlH3gqRrsguhoofXUX /gqLlqsLxqxkKKd9EbSzKRHuDGlJCLm5SlL8wnL0=

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  • my laptop wireless registers as 169.254.111.111

    - by Roalt
    I sometimes gets an ip address of 169.254.111.111 received for my laptop (instead of one in the 10.0.0.x range). I thought it was a problem with my Ubuntu system, but after I dual-booted I got the same problem under Windows Vista with the same laptop. What's the problem, why does it happens only sometimes, and how can it be solved? For the record: I'm using a Linksys WRT610N wireless router.

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  • Windows recording in Vista

    - by devoured elysium
    I want to record the sound that's coming from my applications in Windows Vista. The problem seems to be that Vista seems to only recognize the microphone as input device. Is there any reason for this? I went to Control Panel Sound and I can only see the microphone as recording device. Im using a TX2000 HP laptop. Thanks

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  • Automater for Vista

    - by allindal
    Is a there a similar program for Vista like the MAC application Automator Specifically I'm looking for a vista app that can control timed clicks,example...in automator, I can specify which pixel and how often to click, or a series of click in different places.I'm not looking for an"intelligent clicker" just a purely GUI programed clicker. ALso i need it do work and record the keyboard. From reading other SU posts i can see that c prompt doesn't have an easy to do this.

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  • Media Center keeps re-recording movies (not listed in "Series")

    - by greg88
    When I record a movie in Windows Media Center, it records it again every time it shows up in the Guide listings again - days, weeks, or months later. The movies are not listed as a Series (Recorded TV - Schedules - Series). I found many matches for this problem on Google, and no solutions. Windows XP SP3 w/all current updates; MCE 2005 w/all current updates.

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