There could be several reasons, why 2N® NetSpeaker unit is not connected to the NetSpeaker server :
Older software version 1.2.5 requires that 2N® NetSpeaker unit should assign the IP address automatically
CAUTION even if other devices in the network receives IP address automatically, 2N® NetSpeaker unit does not have got it due to the restrictions set by the IT department in the network. This setting automatically assigns IP addresses only to known/registered devices in the network based on their MAC addresses!
- this network setting (DHCP server assigns IP addresses to registered IP devices only) is solved in software version 1.3.6 and higher which can display in menu Administrator > Netspeaker scanner NsP units connected in the local LAN network based only on their MAC addresses (NsP server sends broadcast into the networks and NsP unit responds to it). The information DHCP is displayed in NetSpeaker scanner but shown IP address is not correct. It shows: 0.0.0.0
What can you do? In this case you should provide the MAC address of the NsP units to the IT department and they will register it and allow automatic assignment of the IP addresses.
Second option is to turn the DHCP client OFF and setup the IP address manually. In this case it is necessary to know some free IP address which can be used for NsP unit in the network. It means that this IP address (the one you would like to use) is not assigned to any other IP device in the network (you can use ping command to check it). Do not forget to set up the IP mask = subnet of the network.
Manual settings could look like this: IP address: 192.168.1.151 IP mask: 255.255.255.0
Firewall can also block connection of 2N NetSpeaker unit to the server
Do you have firewall switched ON? It can cause that if 2N® NetSpeaker unit disconnects from the server and then tries to connect again via the same port, firewall (eg, ESET Smart Security) will not let it go through. This is not the common issue but it could be one of the reason why you cannot see NsP units in menu Destinations & Zones.
Picture below shows the situation when the network automatically assigns IP addresses (there is DHCP server in the network) but the device (e.g. NsP unit is not recognized = IT department does not know its MAC address). In this case IP address for NsP unit would not be automatically assigned .
Picture below shows an example of manually assigned IP address and IP mask,when the DHCP client has been switched OFF: