<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: Sensor States
In PRTG's device tree you usually create several sensors on each 'device'. With sensors, you can monitor different aspects of your devices. Using a simple color code, they always show you what is going on in your network.
The color of a sensor always shows its current status. Following, you find a list of states a sensor can show. This list also reflects the hierarchy of states whenever summarized sensor states are shown (in the device tree, or on geo maps): the higher a status is in the hierarchy, the higher will be its priority in displaying sensor states. For example, if all the sensors of a specific device are Up, but one of its sensors reached a Down status, then the overall status of this device will be Down as well (for example, displayed red in the Tree Map View), as this state is hierarchically higher.
Note: Down and Down (Partial) states are hierarchically equal.
Sensor |
Color |
Status Name |
Meaning |
---|---|---|---|
Red |
Down |
|
|
Red/Green |
Down (Partial) |
In a cluster, at least one node reports this sensor as Down, while at least one other node reports the same sensor as Up. |
|
|
Bright-Red |
Down (Acknowledged) |
The sensor is Down and the status was acknowledged by a PRTG user, applying the Acknowledge Alarm function. This can be helpful to mark that an alarm has already been attended to. For acknowledged alarms no more notifications are sent. To set this sensor status, right-click on a sensor in a Down status and from the context menu, select Acknowledge Alarm.... Then enter a comment and click OK. |
Yellow |
Warning |
There was an error reading the sensor, but PRTG will try again. The sensor may soon change to a down status. Please see Sensor Warning and Down Behavior below for more information. Another reason for this state can be a warning limit set in a sensor's Sensor Channels Settings. |
|
Orange |
Unusual |
The sensor reports unusual values for this weekday and time of day. The unusual detection is based on the historic average data and can be configured or disabled in the system administration. You can also disable unusual detection for certain groups only (see Group Settings). |
|
Green |
Up |
The last check was okay and the sensor receives data. |
|
Blue |
Paused |
The sensor is currently paused (for a certain time or unlimitedly, or by dependency). |
|
Black (Gray) |
Unknown |
The sensor has not been checked yet by PRTG or there is an error in (network) communication, likely on the probe system. If sensors show this status persistently, a PRTG restart may be necessary. For extended trouble shooting please see More section below. |
Sensor Warning and Down Behavior
The Down status symbolizes that something is wrong with a monitored device. There can be various reasons for a down status, for example, an interruption in the physical connection to the device, an internet connection outage, or a crashed server.
After a failed request, PRTG tries to reach the device again before setting a sensor to Down status (this is true for almost all types of sensors):
- If a request to a device fails for the first time, the sensor is set to Warning status. PRTG repeats the request and tries to re-scan the device immediately.
- If also the second request fails, the sensor is set to Down status by default until the device is reachable again. You can change this behavior in the Scanning Interval settings of any monitoring object. PRTG tries to reach the device with every scanning interval.
This procedure gives devices and services the chance to recover from a momentary overload and prevents false alarms. Still, you are informed promptly about any failures occurring.
Note: The behavior described above does not apply to a Warning or Down status that is activated due to a warning or error limit set in the Sensor Channels Settings.
Knowledge Base: What to check if sensors are black (gray)?
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Keywords: Down,Down (Acknowledged),Down (Partial),None,OK,Paused,Sensor,Sensor Behavior,Sensor Status,Unknown,Unusual,Warning