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  1. #1
    Join Date
    Mar 2004
    Posts
    89

    Domains occasionally do not resolve

    Occasionally a client contacts me to tell me that something "is down". They tell me that they see "domain cannot be resolved" message. I even asked them to do a ping or nslookup and it said that it could not find DNS entry.

    The strange thing is that sometimes this happens to the example.com but webmail.example.com or john.example.com would be working fine and vise-versa. Other domains hosted on the same server would resolve no problem on the client's computer.

    Usually this goes back to normal after a few hours or days. I don't see what could be causing this...

    This has happened several times to two clients. They live in the same city, but don't know each other. They are on diffierent ISPs. It happened at different times.

    Server config:
    Linux 2.6.10-1.771_FC2 #1 Mon Mar 28 00:50:14 EST 2005 i686 athlon i386 GNU/Linux
    Plesk 7.5.3
    bind 9.2.3-13

  2. #2
    Join Date
    Jan 2004
    Posts
    445
    Have you checked the DNS setup?
    http://dnsreport.com/

  3. #3
    Join Date
    Mar 2004
    Posts
    89
    Wow. I got quite a few errors and warnings. I will try to fix them myself and If I have any problems I know where to go

    Thank you!

  4. #4
    Join Date
    Mar 2004
    Posts
    89
    I wen't through all error and warn message and found two that worry me.

    The reason they happen is because Plesk automatically creates DNS entry in such manner. If I create a new account with domain widget.com then Plesk will create one NS entry for that domain with the name ns.widget.com -- not the actual name server.

    I edited the NS records manually. I deleted the ns.widget.com and create 2 news ones: ns1.example.ca and ns2.example.ca. The errors went away.

    Here are the error messages I get from dnscheck.com. Is that a major problem?

    Missing (stealth) nameservers

    FAIL: You have one or more missing (stealth) nameservers. The following nameserver(s) are listed (at your nameservers) as nameservers for your domain, but are not listed at the the parent nameservers (therefore, they may or may not get used, depending on whether your DNS servers return them in the authority section for other requests, per RFC2181 5.4.1). You need to make sure that these stealth nameservers are working; if they are not responding, you may have serious problems! The DNS Report will not query these servers, so you need to be very careful that they are working properly.

    ns.widgets.com.

    This is listed as an ERROR because there are some cases where nasty problems can occur (if the TTLs vary from the NS records at the root servers and the NS records point to your own domain, for example).

    Missing nameservers 2

    ERROR: One or more of the nameservers listed at the parent servers are not listed as NS records at your nameservers. The problem NS records are:

    ns2.example.ca.
    ns1.example.ca.

  5. #5
    Greetings:

    If you do a WHOIS (such as from Network Solutions, OpenSRS, etc.), the name servers listed in the order listed must follow through all the way to the server environment.

    If it is listed as

    ns1.example.ca
    ns2.example.ca

    On the WHOIS then it has to be that way on the actual DNS servers.

    If Plesk is randomizing the actual name servers, then you should check the documentation to find out if you can state xyz is the primary and abc are the secondary, and leave them that way.

    Thank you.
    ---
    Peter M. Abraham
    LinkedIn Profile

  6. #6
    Join Date
    Mar 2004
    Posts
    89
    There is a way to do this. Plesk has a DNS template for every created domain. I can just enter the NS servers there. I didn't know this could cause a problem.

    Thank you.

  7. #7
    Join Date
    Dec 2003
    Location
    Sunny So. Calif.
    Posts
    204
    moltar - Make sure you edit the DNS template so future domains being created will not have this problem.

    What you should do is edit the domain's DNS and get rid of any:
    ns.widget.com
    ns2.widget.com

    A or NS entries, put in NS records for your hosting domain's nameservers

    widget.com NS ns.yourhostingdomain.com
    widget.com NS ns2.yourhostingdomain.com

    (of course, replace 'ns' and 'ns2' with whatever you actually have registered at the domain registrar as your nameserver names.

    Be sure to remove any A records which reference the nameservers, the default Plesk DNS template should have had 2 A records which are not needed. And remember to also edit the main DNS template!

  8. #8
    Join Date
    Mar 2004
    Posts
    89
    Ok, I did that. Now I am going to go thru all the domains manually and create the correct entries.

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