Dear all, I want to use the rest module to send post authentication to the server. Related config files are shown below. *default: * authorize { if ("%{Service-Type}" == "Login") { if (&Message-Authenticator) { rest } } } *rest:* rest { connect_uri = "https://127.0.0.1:4433/" tls { client_cert = /path/to/client/cert.pem client_key = /path/to/client/key.key disable_verify_peer = yes check_cert = no check_cert_cn = no } authorize { uri = "${..connect_uri}api/v1/login" method = 'post' body = 'json' tls = ${..tls} data = '{"user": {"name":"%{User-Name}", "passwd": "%{User-Password}"}, "attributes": {"messageAuthenticator": "%{Message-Authenticator}", "clientIP":"%{Packet-Src-IP-Address}"}}' header = 'Content-Type: application/json' connect_timeout = 30 recv_timeout = 30 } } To test it I am using radclient with below command: echo "Service-Type=1, User-Name=caglar,User-Password=caglar, Message-Authenticator=0x00" | ./radclient -s -x -P udp a.b.c.d:1812 auth shared_secret When running freeradius in debug mode, I am seeing that below error: *(0) rest: ERROR: Request failed: 56 - Failure when receiving data from the peer(0) rest: ERROR: Server returned no data* I am also testing server with curl command. And it works properly. curl -v -k -H 'Content-Type: application/json' -d '{ "user": { "passwd":"caglar", "name":"caglar"}, "attributes": { "messageAuthenticator":"0x00", "clientIp": "a.b.c.d"}}' -X POST https://127.0.0.1:4433/api/v1/login --cert /path/to/client/cert.pem --key /path/to/client/key.key Thanks for your support, Caglar