Times out on securityheaders (SH is in DigitalOcean) [1] and qualys [2]. osdev.org is hosted in Linode. Linode status page is green [3] so perhaps an individual VM or application issue. It also appears they had a lot of services exposed to the internet including FTP, SSH, NTP, MySQL and "MBBS Socket Harness" not sure what that is, so there is a possibility.<p>[1] - <a href="https://securityheaders.com/?q=https%3A%2F%2Fosdev.org%2F&followRedirects=on" rel="nofollow">https://securityheaders.com/?q=https%3A%2F%2Fosdev.org%2F&fo...</a><p>[2] - <a href="https://www.ssllabs.com/ssltest/analyze.html?d=osdev.org" rel="nofollow">https://www.ssllabs.com/ssltest/analyze.html?d=osdev.org</a><p>[3] - <a href="https://status.linode.com/" rel="nofollow">https://status.linode.com/</a>