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Key StatusValidity and expiration date.
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Even if the Plesk license is valid, the server must periodically access the Key Administrator service to renew the key. DNS resolution, access to ka.plesk.com TCP 443/5224, firewall/proxy, cron intensity, or a corrupted key file can prevent the update.
Could not update the license
Licensing Server Unreachable
Can't connect to ka.plesk.com:5224 (Timeout)
Couldn't resolve host name
cURL cannot communicate with license serverPlesk license key is stored in a file on the server and is periodically verified with the license server. Even if the key has been purchased, the server may display an expired or update failed message if it cannot establish an external connection.
plesk.com can be resolved to multiple IPs. Binding the firewall rule to a single static IP may cause connection issues in the future.
Plesk can communicate via TCP 443 or 5224 with the Plesk license server. The exit firewall, proxy, provider ACL, and DNS resolver must be checked together.
If the daily Plesk task takes too long, the license renewal step may be delayed. Disk usage calculation or stuck maintenance task can be seen in panel.log.
License expired is not the same as invalid activation code. Purchase/ payment status, IP bound to the license and technical access must be checked separately.
Changing the license file with a key from another server found on the internet is both legally and technically problematic. Licenses must be obtained only from the authorized Plesk/reseller account and for the correct server IP.
Search for the phrase you see in the email, browser, or SSH log. Each card includes meaning, probable cause, and safe initial action.
Meaning: The validity period of the loaded key has expired or cannot be renewed.
Possible cause: Payment, reseller status, or KA connection issue.
Meaning: The server cannot connect to the Plesk licensing service.
Possible cause: Firewall, DNS, proxy, route, or provider block.
Meaning: The license server's name cannot be resolved to the IP.
Possible cause: Resolver error, /etc/hosts entry or DNS exit block.
Meaning: TCP connection has timed out.
Possible cause: The exit firewall, proxy or network path port is blocking.
Meaning: Automatic daily task license renewal has not been completed.
Possible cause: Stuck daily task, intense disk calculation or connection error.
Meaning: Key not validated by Plesk.
Possible cause: Incorrect activation code, different product/IP or cancelled key.
Meaning: An extension or add-on key has filled its duration.
Possible cause: The additional product subscription has not been renewed.
Meaning: Plesk could not reach the cURL request license endpoint.
Possible cause: DNS, TLS, proxy or firewall.
No records matching this expression were found.
Commands are for root access. Collect only status and logs first; Do not change the permanent setting without seeing the reason.
plesk bin license -cIf the loaded license is valid, it returns zero; otherwise, it returns an error code.
plesk bin license --retrieveReloads the loaded license keys from the Plesk license server.
getent ahosts ka.plesk.com
dig +short ka.plesk.comIt shows that the KA hostname can be resolved from the server.
nc -vz ka.plesk.com 443
nc -vz ka.plesk.com 5224The Plesk license server tests the required TCP outgoing connection.
curl -Iv --connect-timeout 10 https://ka.plesk.com/DNS, TCP and TLS layer in one test
grep -Ei 'license|ka\.plesk|key update|curl' /var/log/plesk/panel.log | tail -n 150Displays error codes for the license renewal task.
systemctl status cron --no-pager 2>/dev/null || systemctl status crond --no-pager
ps -ef | grep -E "[d]aily|[s]tatistics"It shows the status of automatic maintenance service and long-running Plesk tasks.
Verify payment and key scope; then test DNS, network access, daily task, and license renewal command sequentially.
Check that the subscription is active in the Reseller or Plesk account, the product version is correct, and the license is tied to the correct IP address.
CLI validity result distinguishes technical connection issue from actual invalid key.
plesk bin license -cVerify that the resolver, 443, and 5224 outputs are working for plesk.com.
A single static KA IP record or proxy error can break access to round-robin endpoints.
Run Retrieve Keys or CLI --retrieve after the connection is fixed.
plesk bin license --retrieveLicense Information screen, panel.log and subsequent daily task results are checked.
In the Reseller portal, the license status, renewal date, and server IP matching are checked.
Plesk can use both ports; the outgoing ACL/firewall rule must also be adjusted for 5224.
Server resolver, checks /etc/hosts and DNS exit port 53.
Cron/crond and Plesk daily maintenance task duration are being examined.
The main Plesk key is not the relevant extension/additional key subscription that needs to be renewed.
With Plesk license, you can communicate over TCP 443 or 5224; outgoing access should not be blocked.
Reloads the loaded license keys from the Plesk license server.
Product and panel features may be restricted based on time; resolve official license status and connection issues promptly.
No. Multiple IPs can be used with round-robin; it is healthier to allow hostname-based exit.
The hostname cannot be resolved, so a connection cannot be established with the license server.
System file paths may vary depending on the version and contain sensitive keys. Plesk CLI or panel should be used for management.
No. WP Toolkit SE, Power Pack, or other extension keys can be separated as an additional license.
By analyzing cPanel, WHM, CloudLinux, LiteSpeed, MariaDB, Exim and security layers together, we fix the root cause of the failure instead of just removing the service.