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Plesk interface runs slow: cURL cannot communicate with license server

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Mikhail Shport
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Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • Plesk interface is unresponsive or Plesk shows the message that the license key is expired

  • The following error is shown in Plesk and in /var/log/plesk/panel.log file:

    PLESK_ERROR: ERR [1] Token validation failed: Can not connect to 'ka.plesk.com' (6:6). Please check connection to 'ka.plesk.com' or contact Plesk support: <a href='https://www.plesk.com/support/' target='_blank'>https://www.plesk.com/support/</a>.; ; KV network error (ka.plesk.com: cURL cannot communicate with license server https://ka.plesk.com/jsonrest/pkp/20/verify-key (): Couldn't resolve host name(6)

  • Retrieving the license from CLI fails with one of the following messages:

    # plesk bin license --retrieve
    Updating Plesk license key:
    [2017-11-24 05:18:02] ERR [panel] KeyUpdate Result code: 2 Unspecified error
    [2017-11-24 05:18:02] ERR [panel] KeyUpdate Result desc: License key is not prolongated yet

    # plesk bin license --retrieve
    Updating Plesk license key:
    2018-09-02T21:25:04+01:00 ERR (3): KeyUpdate Result code: 2 Network failure
    2018-09-02T21:25:04+01:00 ERR (3): KeyUpdate Result desc: Couldn't resolve host name

  • Telnet connection to ka.plesk.com works correctly:

    # telnet ka.plesk.com
    Trying 195.214.233.80...
    Connected to ka.plesk.com.
    Escape character is '^]'.

  • The next command is executed correctly (Do not mind the error):

    # curl https://ka.plesk.com/jsonrest/pkp/20/verify-key
    Authorization failed

  • DNS records of ka.plesk.com cannot be resolved against some of the configured nameservers:

    # cat /etc/resolv.conf
    nameserver 203.0.112.2
    nameserver 8.8.8.8
    # dig ka.plesk.com @203.0.112.2
    ...
    ;; connection timed out; no servers could be reached

Cause

DNS server misconfiguration.

Resolution

  1. Resolve the issue on the side of the DNS server or remove the misconfigured DNS server from the interface settings

  2. Connect to the server via SSH and reinstall license key manually:

    # plesk bin license --install A00000-A00000-A00000-A00000-A00000

Comments

1 comment

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  • Avatar
    Paul O'Toole

    I had the same problem:

    [root@plesk ~]# dig ka.plesk.com @8.8.8.8

    ; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.15 <<>> ka.plesk.com @8.8.8.8
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10616
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 512
    ;; QUESTION SECTION:
    ;ka.plesk.com.                  IN      A

    ;; ANSWER SECTION:
    ka.plesk.com.           82      IN      A       195.214.233.81
    ka.plesk.com.           82      IN      A       195.214.233.82
    ka.plesk.com.           82      IN      A       195.214.233.80

    ;; Query time: 18 msec
    ;; SERVER: 8.8.8.8#53(8.8.8.8)
    ;; WHEN: Sat Nov 04 12:40:34 GMT 2023
    ;; MSG SIZE  rcvd: 89

    [root@plesk ~]# telnet ka.plesk.com 443
    Trying 195.214.233.82...
    Connected to ka.plesk.com.
    Escape character is '^]'.

    But when I tried to update the license it failed with cannot contact server. I had to manually install the license key. Nothing was being blocked through the firewall.....Maybe a problem with the license server?

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