After upgrading the RB1100 to RouterOS version 7.20, users are unable to authenticate through the Hotspot, as evidenced by Mikrotik logs displaying the error "no response from RADIUS server." This critical issue is occurring despite both the Hotspot and the User Manager (Userman)—which acts as the RADIUS server—residing on the same physical hardware. The problem strongly suggests a break in the internal communication loop between the Hotspot and the Userman package after the upgrade, likely due to a bug in version 7.20 affecting the local RADIUS service's listener or response mechanism.