Total Network Monitor

Total Network Monitor (TNM 2) is a network monitoring software program designed to continuously monitor your local network, individual computers, and services that require careful attention. The tool alerts you of any problem encountered in advance and generates a detailed report on the circumstances of the failure. A monitor is a special type of object that keeps track of a particular aspect of service operation, server health, or a file system. You create monitors, fine-tune them to meet your individual demands and run them, and they display the status of your network in real time. If any parameter deviates from its normal state, the monitor executes the action set that is predefined by the user, e.g. plays a sound, sends a detailed description of the incident via e-mail or IM, reboots the remote computer, or launches an application. The monitor log shows the full history of the executed actions and readings from all of the monitors, providing valuable data in everyday network management.

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• Internet protocol sensors (ICMP, TCP, HTTP). Total Network Monitor is linked to the outside world through sensors that provide TNM with all of the data for analysis. The ICMP sensor verifies host availability using ping requests. The TCP sensor checks the connection to a specific TCP port, ensuring a particular service is listening. The HTTP sensor monitors web servers by analyzing HTTP response status codes, load times, and downloaded content integrity, allowing detection of website outages or application errors.
• Windows services and system performance monitoring. The service state sensor monitors critical Windows services to ensure they are in the running state and can automatically attempt to restart them if they stop. The system performance sensor collects Windows performance counters (PerfMon) such as CPU usage, memory consumption, disk activity, or process queues, alerting when thresholds indicating server degradation are exceeded.
• Windows registry and file system verification. The registry state sensor checks for the existence and specific values of Windows registry keys, enabling detection of unauthorized configuration changes. File sensors (file existence, file size, file compare, file count, file CRC32, and file content) examine files on remote computers to verify integrity, detect modifications, count files in directories, or search for specific text strings within files.
• Disk space and email monitoring. The disk space sensor measures free capacity on server drives and alerts when available storage falls below a critical threshold, preventing failures due to insufficient space. Email protocol sensors (SMTP, IMAP) verify the availability and correct operation of mail servers by checking connection, authentication, or test message sending capabilities.
• Visual and audible notifications. When an incident occurs, actions are executed to alert the administrator. The message box action displays a pop-up window on the administrator's screen. The popup window can be sent to other network computers. The play sound action allows assigning different audio files based on event severity, ensuring immediate notification without needing to look at the screen.
• Email and Jabber instant messaging alerts. The e-mail action sends a detailed message with the failure description, affected monitor, and exact time to one or more configured addresses. The Jabber action sends instant notifications to messaging clients using the XMPP protocol, ensuring alerts reach mobile devices or on-call personnel computers.
• Application and script execution for automated response. The launch application action runs an external program on the machine running TNM or on a remote machine. The run script action allows executing scripts (PowerShell, VBS, batch) to perform complex corrective tasks such as freeing disk space or modifying configurations, automating responses to common incidents.
• Automatic service and remote computer restart. The restart service action attempts to stop and restart a failed service, often resolving software issues without manual intervention. The reboot computer action sends a restart command to the remote system, useful when a server becomes completely unresponsive and requires a forced reboot as a recovery measure.
• Historical event logging and monitor statistics. Total Network Monitor 2 records all information from sensor executions into the monitoring log. Any monitor state change is stored in the monitors log. Statistics include the selected monitor's run time and time of the last check, total number of checks, and count of green (OK), red (failure), and black (sensor error) states. The activity diagram graphically visualizes sensor results over time.
• Executed action logging. The software records each executed action into the actions log. This history details which action was triggered, which monitor it belonged to, when it occurred, and the result of its execution (success or failure). This log is essential for auditing automatic system responses and debugging incorrect configurations.
• Visual and interactive network map. The network map function generates a visual representation of the monitoring project. The administrator can arrange device icons on a broad white canvas and render the network structure using links. If a device requires attention, it is highlighted in red directly on the map, providing immediate insight into the overall infrastructure status.

Total Network Monitor is developed by Softinventive Lab. The program's development began in 2004, and the current version (TNM 2) was later released as a complete rewrite. The application is primarily written in the C++ programming language for the Windows operating system, providing high performance and low resource consumption when performing continuous network polling tasks.

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