Dear experts, I'm very sorry for a lame help request but really don't know what else to do. I want to try the simplest setup for some small (embedded) client. So decided to begin with MD5 and username-password. Installed freeradius in Win11 WSL environment, Ubuntu 20.04.6 LTS, via apt install as usual. It brings version 3.0.20. As advised in "getting started" docum, made no changes anywhere besides adding a user and a client. In /etc/freeradius/3/0/users: at beginning: (which is symlnk to mods-config/files/authorize) JIG46 Cleartext-Password := "secret" In /etc/freeradius/3/0/clients.conf: after the existing localhost: client myswitch { ipaddr = 10.183.0.110 secret = testing123 require_message_authenticator = no proto = * nas_type = other } Then started the server on localohst and port 1645 (because the default port appears to be busy): sudo freeradius -X -xx -p 1645 -i localhost Then run : radtest -x -t eap-md5 JIG46 secret localhost:1645 0 testing123 Output: Loading input data... including dictionary file /usr/share/freeradius/dictionaryReading input vps from stdin Read 1 element(s) from input: stdin Loaded: 1 input element(s). Adding new socket: src: 0.0.0.0:0, dst: 127.0.0.1:1645 Added new socket: 5 (num sockets: 1) Transaction: 0, sending packet: 0 (id: 151)... Sent Access-Request Id 151 from 0.0.0.0:59783 to 127.0.0.1:1645 length 69 User-Name = "JIG46" Cleartext-Password = "secret" NAS-IP-Address = 127.0.1.1 NAS-Port = 0 Message-Authenticator = 0x00 EAP-Code = Response EAP-Type-Identity = 0x4a49473436 EAP-Message = 0x024d000a014a49473436 Timeout for transaction: 0, tries (so far): 1 (max: 3)Transaction: 0, sending packet: 1 (id: 151)... ............ two more tries...... Timeout for transaction: 0, tries (so far): 3 (max: 3)No response for transaction: 0, giving upDeallocating (sockfd: 5, id: 151) Main loop: done. The server refuses to start EAP handshake - I don't see any errors due to unknown usernames or wrong passwords? Exactly the same outcome with a real client (a managed switch, with the client id myswitch, defined above). *** The complete log is here. https://gist.github.com/pavel-a/7b0c0c230ad28627218eade7fb0d1c61 Please advise? Is this because of WSL or something wrong in the configuration?? *** Windows firewall is OFF. - ddbug