Hi, Freeradius server version : 3.0.17, 64bit OS : CentOS 7.2 We have setup Freeradius to authenticate users to get access to WiFi. Freeradius is connected to Active Directory servers for authentication. Recently Freeradius logged the message "NT_STATUS_ACCESS_DENIED" in the authentication logs and users were not authenticated. Additionally, I can see the below logs in Freeradius: ERROR: (3978) ntlm_auth: ERROR: Program returned code (1) and output 'NT_STATUS_NO_MEMORY: Memory allocation error (0xc0000017)' Auth: (3978) Login incorrect (ntlm_auth: Program returned code (1) and output 'NT_STATUS_NO_MEMORY: Memory allocation error (0xc0000017)') On the another day we got the same issue, same error message and in the Freeradius logs, we got: ERROR: (43458) mschap: ERROR: Program returned code (1) and output 'Memory allocation error (0xc0000017)' Auth: (43458) Login incorrect (mschap: Program returned code (1) and output 'Memory allocation error (0xc0000017)') When we rejoin the Active Directory domain, the issue gets resolved. Not sure where the issue lies. Kindly help me. Thank you. Regards, Burn Zero