Broken links on general information page

[isaisabel]

Links to SANS papers on the general information page are broken:

1. Automation: The Wonderful Wizard of CTI (Or Is IT?)
2. Adaptive Adversary Emulation with MITRE ATT&CK
3. Lessons Learned Applying ATT&CK-Based SOC Assessments
4. Do-It-Yourself ATT&CK Evaluations to Improve Your Security Posture
5. ATT&CKing the Status Quo: Threat-Based Adversary Emulation with MITRE ATT&CK

[vsun757]

Is the issue that the articles are now behind a paywall or that they get a 404 error?