Compare the decrypted value to the calculated hash.

Calculate the hash value using the algorithm specified in the Signature Algorithm field of the certificate data up to but not including the signature.

Using the public key from the signing certificate decrypt the signature.

Read the Signature Algorithm field for the has and encryption type used.

Starting at the certificate signed by the root CA check each certificate for validity period and correct subject naming.

If the issuer's certificate is not a root CA then continue up the chain until you obtain all the certificate from the root CA to the certificate of interest.

The location of the issuer's certificate is typically specified by the 'Authority Information Access' field.

Save the certificate as a file (DER, Base-64, or PKCS #7).

How (and where) can I check if the new SSL certificate is valid? I suggest trying Wireshark to see what server Pidgin is actually contacting, and what happens at the SSL level. Actually, the message you get is a rather definite indication that you do not get the right certificate, so you'd better use the message as a symptom and investigate if you indeed connect to the right server. There is obviously some sort of worldwide load-balancing in action here.Д«ottom-line: you cannot check 'by yourself' whether a certificate is good or not, save perhaps by phoning the Google headquarters and having them spell out the certificate fingerprint (which they might agree to they are rumoured to value such kind of humour). From another machine on another continent, is resolved to an alias to talk.l., which this time has IP 209.85.147.125. Ask your hosting provider if they have secured the Plesk mail server with a valid SSL/TLS certificate (not with the self-signed. Go to Mail > the Mail Settings tab, click the domain name, select the SSL/TLS certificate for webmail, and then click OK. Uploading the certificate you already own. It is possible to workaround this by including the. Purchasing a certificate from a certificate authority. I think there is no way to intercept the certificate validation process in Metro apps (StreamSocket class doesnвЂ™t allow this).

and not ), most public servers use correct certificates, not self-signed ones. From my home machine, is resolved to an alias to talk.l., which has IP 74.125.113.125. First make sure you are using correct server address (e.g. Note that Google is known to play tricks with the DNS. there is something fishy in your Pidgin configuration.ДЇrom here, connecting to port 443 on results in a server certificate which includes the name: subject=/C=US/ST=California/L=Mountain View/O=Google Inc./CN=, which is correct.

some mishap at your ISP implied a bad DNS configuration which emulates the effect of DNS poisoning, redirecting your connection attempt to the wrong server.some ill-intentioned third party is actively redirecting your connection to the wrong server, possibly by DNS poisoning.The message you quote means: 'I wanted to talk to a server called, but what responded there seems to use a certificate which has the name in it, and not '.

Gmail certificate not valid