Fixing a Certificate That Works on Desktop But Not Mobile
The single most common cause: an incomplete intermediate chain.
50 guides decoding specific error codes and messages across browsers, developer tools, and platforms — with the fix, not just the explanation.
The single most common cause: an incomplete intermediate chain.
The certificate and private key need to move with the site — they don't follow automatically.
The single most common root cause across nearly every troubleshooting scenario in this category.
Correct behavior, not a bug — staging certificates are intentionally not publicly trusted.
A server's own wrong clock can break both issuance and validation — check it explicitly.
Several sites, one IP, and a configuration that isn't correctly routing by hostname.
The certificate was deliberately invalidated — this needs reissuance, not a config fix.
Often a network-level or firewall issue rather than anything about the certificate itself.
The same root cause as any mixed content issue, harder to spot in dynamically rendered content.
Reading the specific alert OpenSSL reports narrows the cause far faster than guessing.