We have a working FreeRADIUS implementation. It is configured for EAP-TLS. Our production systems use stock rpms for FreeRADIUS and OpenSSL on CentOS 7.9. Current RPMs: freeradius-3.0.13-15.el7.x86_64 and openssl-1.0.2k-26.el7_9.x86_64 We are moving to Red Hat Enterprise Linux 8.8. We built a test system from scratch, installed our RADIUS config and our tests failed. The RPMs in RHEL 8.8 are: freeradius-3.0.20-14.module+el8.8.0+17558+3f8a93b9.x86_64 and openssl-1.1.1k-9.el8_7.x86_64 The failure occurs in CRL checking. With check_crl = yes and check_all_crl = yes, FreeRADIUS is unable to find our root CA's CRL to validate the intermediate CA. Setting either check_crl or check_all_crl to no resolves the issue. (8) eap_tls: TLS-Cert-Serial := "XXX" (8) eap_tls: TLS-Cert-Expiration := "250901211201Z" (8) eap_tls: TLS-Cert-Subject := "/C=US/O=Organization/CN=Organization Intermediate CA" (8) eap_tls: TLS-Cert-Issuer := "/C=US/O=Organization/CN=Organization Root CA" (8) eap_tls: TLS-Cert-Common-Name := "Organization Intermediate CA" (8) eap_tls: ERROR: SSL says error 3 : unable to get certificate CRL (8) eap_tls: >>> send TLS 1.2 [length 0002] (8) eap_tls: ERROR: TLS Alert write:fatal:unknown CA tls: TLS_accept: Error in error (8) eap_tls: ERROR: Failed in __FUNCTION__ (SSL_read): error:1417C086:SSL routines:tls_process_client_certificate:certificate verify failed (8) eap_tls: ERROR: System call (I/O) error (-1) (8) eap_tls: ERROR: TLS receive handshake failed during operation (8) eap_tls: ERROR: [eaptls process] = fail (8) eap: ERROR: Failed continuing EAP TLS (13) session. EAP sub-module failed Checking the leaf certificate against the intermediate CA appears to work. All of the certificates in /etc/raddb/certs have the correct hashed symlinks. We have tried setting tls_min_version = 1.2 and auto_chain = no, adding the intermediate CA certificate to the certificate_file. The same error results. I can break our production servers in the same manner by removing the hash symlink to the root CA's CRL file. In our test system, it's as if the hash symlink doesn't exist. The permissions on the files are correct - radiusd can read them all. Thank you for any help/suggestions Fraser Hess Workstation Engineer Pinnacol Assurance -- This communication and any attachments are for the sole use of the intended recipient and may contain confidential and privileged information. Any unauthorized review, use, disclosure, or distribution is prohibited. If you have received this communication in error, please notify us immediately by replying to this message and deleting it from your computer.