it seems this is maybe causing a problem...
nginx.conf:
ssl_stapling on;
ssl_stapling_verify on;
$ echo | openssl s_client -connect rumbly.net:443 -status
CONNECTED(00000003)
depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = E6
verify return:1
depth=0 CN = rumbly.net
verify return:1
OCSP response: no response sent
Intent to End OCSP ServiceToday we are announcing our intent to end Online Certificate Status Protocol (OCSP) support in favor of Certificate Revocation Lists (CRLs) as soon as possible. OCSP and CRLs are both mechanisms by which CAs can communicate certificate revocation information, but CRLs have significant advantages over OCSP. Let’s Encrypt has been providing an OCSP responder since our launch nearly ten years ago. We added support for CRLs in 2022.
Websites and people who visit them will not be affected by this change, but some non-browser software might be.