Server :: Manager





Server Manager

Note: You must start the service!


Use the Server Manager (SDRServerManager.exe) to configure the server (SDRServerService.exe) which runs as a Windows service. Start the Server Manager from either the Windows Start menu or the Tools pane of the Console's ribbon bar.

Before starting the service you must:

  • Define at least one account,
  • Add at least one radio definition,
  • Check the network definition.


The account definition is very basic, at least one account is required otherwise there will be no logins!

Radio Definitions

Select radios just as you do in the console.


The Firewall definitions are optional, you can also control access using your routers although configuring a router can be rather slow. Each firewall definition is an IPV4 dotted address added to either the Allow (whitelist) or Block (blacklist). Remeber to check Enable to apply the Firewall definitions.

When enabled, the logic is:

  1. If the address is in the Block (blacklist) the connection is rejected.
  2. If there are no entries in the Allow (whitelist) the connection is accepted.
  3. If the address is in the Allow (whitelist) it is accepted.
  4. If the address is not in the Allow (whitelist) it is rejected.


Incoming Connections

Select the address to listen on - usually any address is OK, but you can restrict the address to a specific network adapter, for example a wired connection. The default port is 50101. If the Windows firewall is enabled you must ensure the port is added to the list of open ports in the Inbound rules, the protocol used is TCP.


There are seperate settings for LAN (your local network) and WAN (the outside network).

Compression: reduce the bandwidth by using both Huffman code and a clever idea by Youssef Touil (Airspy, SDR#) to ensure no more than 16 bits are required to send each 32-bit sample.

Max bandwidth: restrict the maximum bandwidth, the actual bandwidth will be less than this. When you select a Max bandwidth a corresponsing value in bits is updated.

If compression is enabled the calculation is 18 bits per sample (16 bits per sample + 2 bits for TCP overhead). If compression is not enabled the calculation is 34 bits per sample (32 bits per sample + 2 bits for TCP overhead).

Hint: monitor the current bandwidth in the Connections window.


Install will:

  • Add the Windows service V3 Server,
  • Set the service to automatically restart if it ends unexpectedly,
  • Set the service to start when your system starts,
  • Start the service using the local system account (this is a predefined system account). Many Windows services use this account, with Windows 10 you use the task Manager to display services.





Server Address

WAN (Public) or LAN (Private) Address?

You have two two addresses to consider:

  • WAN (Public) - as seen by the outside world when accessing your network. This address is assigned to you by your ISP [link], this is the address accessed via
  • LAN (Private) - this is your internal address [link].

When you access a server locally you can always use the server's LAN address - the address on your local network - typically in the 192.168.x.x range. You may be able to access using the WAN (public) address, this all depends on your router. Newer, better routers usually support access to the LAN via the WAN address.

Static WAN Address

If you are making your server available to computers outside your network (access over the internet) then a static WAN (static IP) address is very highly recommended.

Normally your ISP will assign you a public IP address, you see this in your router settings; an example from an ASUS RT-AC3200 is shown below. To avoid the address changing you should have a static IP address. Most ISPs allow you to purchase a static IP address (keeping the same IP address) for a small fee, for example £5 one-off from plusnet in the UK.

LAN Address

Open a Command Prompt window, type the command ipconfig and press Enter. This command lists all the network adapters (both Ethernet and wireless) found on your Windows computer, and it shows details about each of them. For each network adapter, you see both the IPv4 address and the IPv6 Address.

Enter the command ipconfig /? for a list of all options.


Ethernet Radios & Firewall

If you are using a radio with an Ethernet connection such as:

  • NetSDR,
  • CloudIQ,
  • Afredi

and do not see any data in the console's waterfall then the UDP data from the radio is probably blocked by a firewall, for example Windows Defender. To enable UDP data from the radio you must add an inbound firewall rule to allow UDP on the Radio's port to SDRServerService.exe from either the radio's address or any address on the local LAN .



Access: Public or Private?

To ensure your server is private (cannot be accessed from the internet):

  • Do not open the server port in your router,
  • Add a firewall entry in your router (if supported) to explicitly block access to the server port (the server uses TCP),
  • Do not enable the On-Air option (below).

To allow public access:

  • Configure your router to forward TCP on the server's port to the computer where the server is running,
  • Check firewalls (including Windows Defender Firewall) allow access on the server's port,
  • Enable On-Air (below) if you want an entry on


Firewalls and Routers

Configuring a server requires knowledge of:

  • Firewalls such as Windows Defender Firewall, and
  • Routers.


You will be required to follow these steps:

  1. Add an inbound rule in your firewall to allow incoming TCP connections on the port assigned to the server (usually port 50101).
  2. If using an ethernet-based radio (see below), add an inbound rule to allow UDP data from the radio to the server computer.


If accessing the server from the internet (a WAN connection) you will add a port forwarding entry for TCP on the server port (usually 50101) with the local IP of the computer where the server is installed. (It is recommended that the IP address of the server is fixed.)

Corporate & Hotel Problems

Sadly some companies and hotels don't like employees and guests accessing dubious servers, it is quite common for access to your server to be blocked while you are at work or on holiday. 


USB Radios

Most consumer SDR radios (SDRplay, Airspy, ELAD) take power from the USB bus. Even running just two devices can require more USB current than is available - there is no guarantee that each USB port on your computer can supply enough current simultaneously.

If using two or more USB radios you should either connect each radio to a seperate USB hub or - better - get a quality external powered USB hub.