Overview This error indicates that the SSL/TLS connection failed because the server is using Diffie-Hellman (DH) parameters that are considered too small by modern security standards. It is most commonly encountered when connecting to servers that still use weak or outdated cryptographic configurations. What causes this error? The error occurs when: Modern OpenSSL versions (1.1.1+ […]
Articles Tagged: uptime monitor
Error 35: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure
Cause This error occurs when the monitoring server fails to complete the SSL/TLS handshake with the target website. In most real-world cases, this is not caused by outdated SSL protocols, but by an inconsistent or broken server-side TLS configuration. A common scenario is when the domain resolves to multiple IP addresses, with at least one […]
Uptime Monitoring – WebSnapshots
Our Uptime Monitoring system will try to capture a snapshot of your website after it has been detected to be down. The WebSnapshot is composed of a screenshot and the source code of the website. Where to find these? WebSnapshots can be found in two places: 1. In your Uptime Monitors dashboard, whenever a website […]
Uptime Percentage Period (per status page)
We’ve described how to configure this feature for your entire account in the following article: https://docs.hetrixtools.com/uptime-percentage-calculation/ In this article, we’ll show you how to configure this feature for each of your Status Pages individually, if you need to have different periods for different pages. Start by going to your Status Pages dashboard from your client […]
Advanced cron job monitoring
In this guide, we’ll show you how to set up your cron job Heartbeat Uptime Monitor to accept Linux-based cron strings. Start by going to the Uptime Monitors dashboard from your client area menu. Now, click on the “Add Monitor” button to add a new Uptime Monitor to your account. Select the “Heartbeat Monitor” under […]
Group Actions – Add/Replace/Remove Private Notes
You can now use our Group Actions to modify the Private Notes of multiple uptime monitors at once, in bulk. Start by going to your uptime monitors dashboard from the client area side menu: Now, select the uptime monitors whose Private Notes you wish to change, and select “Add/Replace/Remove Private Notes” from the drop-down Group […]
SIGNL4 Integration
If you’d like to start receiving our notifications in your SIGNL4 account, please follow the setup guide below. Start by heading to your SIGNL4 dashboard, and click on the “Integrations” link from the side menu: Then, on your Integration panel, click on the “Installed” button to view your installed integrations: Now, on the page containing […]
Pause an Uptime Monitor
In this guide, we’ll show you how you can pause one or more of your Uptime Monitors. Pausing an Uptime Monitor will completely stop monitoring it while it remains paused, unlike our Maintenance Mode, which continues to monitor your website or server while active. We recommend using Maintenance Mode in favor of pausing an Uptime […]
Changes to our Uptime Monitoring Network
[Oct 6, 2025] These changes are essential only if you’ve previously whitelisted our uptime monitoring IPs in your firewall; otherwise, no action is required on your part. The changes below will take effect on October 15, 2025. However, you can make modifications to your firewall at any point until then. The following nodes will be removed from […]
Configure CPU Temperature Warnings
If you have installed our Server Monitoring agent on your server, you can monitor your CPU’s temperature and receive warnings when it gets too high. To get started, assuming you have already installed the agent on your server, head on to your Uptime Monitors dashboard from your client area menu. Click on the Uptime Monitor […]