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  • 1.  Warning Event Notification / Could not connect to DNS server

    Posted Thu March 21, 2024 02:20 AM
    Edited by Thomas Greß Thu March 21, 2024 02:22 AM

    Hi,

    I get this warning message 3-6 times a day.

    Error ID = 9213 : Could not connect to DNS server # Error Code = 1585 : Could not connect to DNS server # Error Sequence Number = 509 # Timestamp = Thu Mar 21 05:21:54 2024 # 

    I tried all 3 of our DNS Server -> same behavior

     -> lsdnsserver
    id name type IP_address status
    0  DNS1 ipv4 10.0.0.7   reachable

    I also checked if the firewall is blocking the DNS server. No blockage detected.
    2024-03-21 05:16:41 ALLOW UDP 10.55.0.23 10.0.0.7 56195 53 0 - - - - - - - RECEIVE
    2024-03-21 05:21:41 ALLOW UDP 10.55.0.23 10.0.0.7 37467 53 0 - - - - - - - RECEIVE
    2024-03-21 05:21:51 ALLOW UDP 10.55.0.23 10.0.0.7 54035 53 0 - - - - - - - RECEIVE

    Is there a log where I can get more information?

    One solution would be to switch completely to IP communication without DNS, but I would like to know what the problem is here

    And I also receive the email / Information via a resolved DNS name. So DNS resolution works


    If you need any further information please let me know.


    Thank you.



    ------------------------------
    Thomas Greß
    ------------------------------



  • 2.  RE: Warning Event Notification / Could not connect to DNS server

    Posted Thu March 21, 2024 03:23 AM

    Hi Thomas,

    you can also check "sainfo traceroute -ip_or_name 10.0.0.7"  (or dns01.local)



    ------------------------------
    Nezih Boyacioglu
    ------------------------------



  • 3.  RE: Warning Event Notification / Could not connect to DNS server

    Posted Thu March 21, 2024 11:19 AM

    Hi Nezih,

    both are working 

    sainfo traceroute -ip_or_name 10.0.0.7
    traceroute to 10.0.0.7 (10.0.0.7), 30 hops max, 60 byte packets
     1  10.55.0.1  0.266 ms  0.281 ms  0.280 ms
     2  10.0.0.7  0.136 ms  0.231 ms  0.238 ms

    sainfo traceroute -ip_or_name xx.xx.xxx.de
    traceroute to xx.xx.xxx.de (10.0.0.7), 30 hops max, 60 byte packet
     1  10.55.0.1  0.340 ms  0.350 ms  0.350 ms
     2  10.0.0.7  0.082 ms  0.121 ms  0.130 ms



    ------------------------------
    Thomas Greß
    ------------------------------

    Original Message


  • 4.  RE: Warning Event Notification / Could not connect to DNS server

    Posted Thu March 21, 2024 05:56 AM

    Hi Thomas, 

    unfortunately, there are no additional logs to look at.

    Feel free, however, to raise a support ticket for this issue so we can conduct a thorough analysis.



    ------------------------------
    Best regards, 

    Christian Schroeder
    IBM Storage Virtualize Support with Passion
    ------------------------------



  • 5.  RE: Warning Event Notification / Could not connect to DNS server

    Posted Thu March 21, 2024 09:04 AM

    I did some additional investigation on that topic.

    In the past, availability of the configured DNS server objects was checked by regular pings,

    lost or blocked ICMP packets hence could trigger the observed error 1585/9213.

    This was changed with 8.6.0 code stream, so depending on the version you are using, it might not apply here. 

    So, the recommendation I made above remains the same to address this through a formal support case.



    ------------------------------
    Best regards, 

    Christian Schroeder
    IBM Storage Virtualize Support with Passion
    ------------------------------

    Original Message


  • 6.  RE: Warning Event Notification / Could not connect to DNS server

    Posted Fri March 22, 2024 12:59 AM

    HI Christian,

    I'm on 8.6.3.0 to benefit from the new ransomware feature (new FS5200 with FSM4). 

    Thank you for your help. I will open a support case.



    ------------------------------
    Thomas Greß
    ------------------------------

    Original Message


  • 7.  RE: Warning Event Notification / Could not connect to DNS server

    Posted Sat March 23, 2024 06:58 AM

    Hi,

    I found the solution to fix this problem. I researched the DNS server logs. The Flasystem is trying to get a PTR record for its IP address. Most of the answers were answered with "NXDOMAIN". But some with "SERVFAIL". When "SERVFAIL" occurred, I received the message from the storage.


    Solution: Create PTR entry for the storage. Since then there has been no further notification.



    ------------------------------
    Thomas Greß
    ------------------------------

    Original Message


  • 8.  RE: Warning Event Notification / Could not connect to DNS server

    Posted Mon March 25, 2024 03:30 AM

    Hello Thomas,

    thanks a lot for sharing your findings, this is really appreciated!

    This fact was new to me as well, so it may help us addressing similar issues in the future.



    ------------------------------
    Best regards, 

    Christian Schroeder
    IBM Storage Virtualize Support with Passion
    ------------------------------

    Original Message


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