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The system failed to complete validation of “my_domain.com”’s “PTR” because of an error: (.......in-addr.arpa/PTR) timeout

bitpt
An error appears randomly when testing "email deliverability" "The system failed to complete validation of" srv.example.com "" PTR "because of an error: (....... in-addr.arpa/PTR) timeout. After some tests (2 or 3) blue "properly configured" appears. Testing in all dns tools that I know and other searched in GG, none of them gives an error in the PTR. Performing the tests requested by the hosting provider. #speedtest-cli Testing download speed Download: 922.93 Mbit/s Testing upload speed Upload: 928.80 Mbit/s ehttool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Advertised pause frame use: Symmetric Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Link partner advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Link partner advertised pause frame use: No Link partner advertised auto-negotiation: Yes Link partner advertised FEC modes: Not reported Speed: 1000Mb/s # iperf3 ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-1.00 sec 114 MBytes 954 Mbits/sec 0 363 KBytes [ 4] 1.00-2.00 sec 113 MBytes 945 Mbits/sec 0 368 KBytes [ 4] 2.00-3.00 sec 112 MBytes 938 Mbits/sec 0 369 KBytes [ 4] 3.00-4.00 sec 113 MBytes 945 Mbits/sec 0 369 KBytes [ 4] 4.00-5.00 sec 112 MBytes 938 Mbits/sec 0 369 KBytes [ 4] 5.00-6.00 sec 112 MBytes 940 Mbits/sec 0 372 KBytes [ 4] 6.00-7.00 sec 112 MBytes 940 Mbits/sec 0 389 KBytes [ 4] 7.00-8.00 sec 112 MBytes 939 Mbits/sec 0 411 KBytes [ 4] 8.00-9.00 sec 112 MBytes 942 Mbits/sec 0 411 KBytes [ 4] 9.00-10.00 sec 113 MBytes 946 Mbits/sec 0 411 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-10.00 sec 1.10 GBytes 943 Mbits/sec 0 sender [ 4] 0.00-10.00 sec 1.10 GBytes 941 Mbits/sec receiver # mtr -rw -c 100 ... OUT and IN no significant packet loss Can be a Cpanel whm Issue??

Comments

7 comments

Date Votes
  • cPRex Jurassic Moderator
    Hey there! Sorry to hear about that issue. When this happens, are you able to perform a "dig -x 1.2.3.4" command from the server, where the "1.2.3.4" is your server's IP address that you're checking? That's all that happens with the rDNS check, so it would be interesting to know if that also is not working during the times you experience those issues. If that does fail during those times, but works during other times, that would point to some type of intermittent network issue on the machine.
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  • bitpt
    Hey there! Sorry to hear about that issue. When this happens, are you able to perform a "dig -x 1.2.3.4" command from the server, where the "1.2.3.4" is your server's IP address that you're checking? That's all that happens with the rDNS check, so it would be interesting to know if that also is not working during the times you experience those issues. If that does fail during those times, but works during other times, that would point to some type of intermittent network issue on the machine.

    I put all network tests, no failures, and i saw same issue reported from other users in forum in last months. Dig or all other test are ok... I "guess" this is a cpanel problem all tests are ok from outside/inside and from all resolvers. Be my guest if you want investigate, no email failures reported from users accounts, only errors in whm or cpanel when email deliverability is tested Seems a false positive, but some users(clients) report this error whitout failures in emails. Disable firewalls makes no difference.
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  • cPRex Jurassic Moderator
    Could you open a ticket for this issue so we can take a closer look? If you do that, please post the ticket number here so I can update everyone with the resolution and share that with the community.
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  • bitpt
    Ticket 93955608....
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  • cPRex Jurassic Moderator
    Great - I see Anthony is on the case and I'm watching that as well, so I'll post an update here once that is resolved.
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  • bitpt
    solved by support
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  • cPRex Jurassic Moderator
    I'm glad we were able to get that resolved. The issue ended up being a problem with the server not being able to make outbound IPv6 connections.
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