I’ve recently set up an SSL certificate with Let’s Encrypt on my Droplet. It’s for three domains in total (two
www domains and a subdomain for one of them,
files). I’m using PHP7 and Apache 2.4.17 from a PPA, and I’ve also set up HTTP/2. The certificate was created on 19 March and it expires on the 17 June, though yesterday some problems popped up. Whenever I submit a form both Firefox and Chrome most of the time report an error with the certificate (Firefox is not at all specific, Chrome mentions an
ERR_SPDY_PROTOCOL_ERROR). I first noticed it on the login form, and it only seems to happen when I enter at least a valid username. Just before I noticed the problem for the first time, I switched my users table to use UUIDs instead of auto incrementing IDs. Could that, or maybe setting cookies, be causing the problem? I doubt it because it worked before.
I’m really not sure what to do here, should I delete the certificates an generate new ones?
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