Hello everyone, I'm the maintainer for FreeRADIUS in RHEL and Fedora. We have found an issue when using FreeRADIUS 3.0.21 and OpenSSL 3.0. Running eapol_test with the attached config (EAP-TTLS-TLS) fails with the following errors (logs attached): (9) eap_ttls: ERROR: Invalid ACK received: 256 (9) eap_ttls: ERROR: [eaptls verify] = invalid (9) eap_ttls: ERROR: [eaptls process] = invalid (9) eap: ERROR: Failed continuing EAP TTLS (21) session. EAP sub-module failed Tried updating to 3.0.23 and the issue seems to be fixed. However due to the updates policy we can't do a full upgrade, so we have to backport fixes to 3.0.21. I am having issues finding the commit(s) that fix this issue, so any help would be appreciated. I'm not sure this is related, but we are hitting an error with the same error message as this one but using MSCHAPv2. Here's the report: https://bugzilla.redhat.com/show_bug.cgi?id=2014525 This is still valid in the latest FreeRADIUS release (3.0.25). Thank you!