I have freeradius 3.0 which is installed on ubuntu 18.10 , I am working on hotspot system using Mikrotik with freeradius , I was able to send login Request from Mikrotik to radius server without any problem , but then I enabled Ufw in ubuntu machine , then I disabled UFW , Now Mikrotik can send request to freeradius but freeradius can not send response to Mikrotik , I don't know what is the problem , I disabled UFW and even I removed it from the server ,but still Mikrotik Can not get response from Radius this is the debug of Freeradius (0) [expiration] = noop (0) [logintime] = noop (0) accessperiod: WARNING: Couldn't find check attribute, control:Access-Period, doing nothing... (0) [accessperiod] = noop (0) pap: WARNING: Auth-Type already set. Not setting to PAP (0) [pap] = noop (0) } # authorize = ok (0) Found Auth-Type = Accept (0) Auth-Type = Accept, accepting the user (0) # Executing section post-auth from file /etc/freeradius/3.0/sites-enabled/default (0) post-auth { (0) update { (0) No attributes updated (0) } # update = noop (0) sql: EXPAND .query (0) sql: --> .query (0) sql: Using query template 'query' rlm_sql (sql): Reserved connection (2) (0) sql: EXPAND %{User-Name} (0) sql: --> test (0) sql: SQL-User-Name set to 'test' (0) sql: EXPAND INSERT INTO radpostauth (username, pass, reply, authdate) VALUES ( '%{SQL-User-Name}', '%{%{User-Password}:-%{Chap-Password}}', '%{reply:Packet-Type}', '%S') (0) sql: --> INSERT INTO radpostauth (username, pass, reply, authdate) VALUES ( 'test', '0x8da5209f622859ac89fd640527cb56139a', 'Access-Accept', '2020-08-12 21:07:21') (0) sql: Executing query: INSERT INTO radpostauth (username, pass, reply, authdate) VALUES ( 'test', '0x8da5209f622859ac89fd640527cb56139a', 'Access-Accept', '2020-08-12 21:07:21') (0) sql: SQL query returned: success (0) sql: 1 record(s) updated rlm_sql (sql): Released connection (2) (0) [sql] = ok (0) [exec] = noop (0) policy remove_reply_message_if_eap { (0) if (&reply:EAP-Message && &reply:Reply-Message) { (0) if (&reply:EAP-Message && &reply:Reply-Message) -> FALSE (0) else { (0) [noop] = noop (0) } # else = noop (0) } # policy remove_reply_message_if_eap = noop (0) } # post-auth = ok (0) Sent Access-Accept Id 23 from 172.16.1.148:1812 to 172.16.1.252:40180 length 0 as u see from the last line , Freeradius sending Access-accept to Mikrotik , but this response not received by mikroitk and Mikrotik through Login Feild No Response From Radius I tested Mikrotik with another freeradius server and it is working without any problem So , I think there are somethings which prevent the response packet to Mikrotik .