In accordance with Lets Encrypt’s 90-day certificate expirations (as mentioned previously), here we go again. Fear not, the Certificate Mismatch warning is normal. But again, for the paranoid, here are the fingerprints to verify:
SHA1 Fingerprint:
16:CA:65:79:A6:D5:44:3E:5C:9D:39:1D:34:E3:5C:57:F7:09:13:F7
SHA-256 Fingerprint:
F7:90:29:3F:04:0D:F2:A4:87:A3:9A:12:FF:3D:CA:EE:F4:23:04:64:2B:EA:0B:08:5B:AB:74:8E:94:84:BA:EE
The new expiration will be 10/4/17.
–Simon