Troubleshooting missing devices

If a device that you expect to find in your network topology is not present, follow these steps to troubleshoot the problem.

Before you begin

Before following these steps, run a full discovery with feedback enabled.

To check some common causes for a device not being found in the network maps, complete the following steps.

Verify that the device you are looking for is running and connected to the network.
Search for the device.
1. Search for the device in the network maps by hostname and then by IP address.
2. If you know which devices it is connected to, try finding one of the connected devices in the Network Hop View. Then set the number of hops to 1 and see if the device is shown as connected.
Check whether the device is in scope. Review the discovery scope, including exclusion zones, in the Scope tab of the Network Discovery Configuration GUI.
Check if the device is being filtered out of the discovery.
1. Click Filters.
2. Review the prediscovery and postdiscovery filters to ensure that the device is not being prevented from being discovered or instantiated.
3. Search the ncp_disco.domain.log file for the device name.
  If the device has been filtered out by a postdiscovery filter, messages are present such as:
```
Filtering entity name and not sending to model
```
```
name matches the instantiateFilter
```
  If a device relationship has been filtered out by a postdiscovery filter, messages are present such as:
```
Filter relationship involving name
```