SSL HandShake exception

Question

I use SSL connection to connect web client to server. It works without any problem for a long time. But from yesterday it gives following error can anyone tell me the reason.

javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.checkEOF(SSLSocketImpl.java:1172)
        at com.sun.net.ssl.internal.ssl.AppInputStream.read(AppInputStream.java:65)
        at net.schubart.fixme.internal.MessageInput.readExactly(MessageInput.java:166)
        at net.schubart.fixme.internal.MessageInput.readMessage(MessageInput.java:78)
        at cc.aot.itsWeb.ClientWriterThread.run(ClientWriterThread.java:241)
        at java.lang.Thread.run(Thread.java:619)
clientWriter.ready
Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown
        at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174)
        at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:136)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:1586)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:865)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1029)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:621)
        at com.sun.net.ssl.internal.ssl.AppOutputStream.write(AppOutputStream.java:59)
        at java.io.OutputStream.write(OutputStream.java:58)
        at net.schubart.fixme.internal.Message.write(Message.java:267)
        at net.schubart.fixme.internal.MessageOutput.writeMessage(MessageOutput.java:53)

Answer 1

If you really really need to, you can accept all certificates. But keep in mind that this is really ugly.

Hava a look at this.

Answer 2

This 'certificate_unknown' is a very misleading error message. This is the same error message thrown when a certificate has expired even if it is in the truststore. I suggest checking the expiration date of the certificate before you waste your time on anything else.

Answer 3

I have spent more than 12 hours on this issue. After creating a self-signed certificate it is required to export that certificate to the cacert file. In my case it was located in /usr/lib/java/jre/lib/security/cacert. You can export the certificate by using the keytool (you probably have to have root access):

$ sudo keytool -exportcert -alias keyStoreAlias -keystore \
       keyStoreKeys.keys -file /usr/local/java/jre/lib/security/cacerts

Answer 4

The certificate presented by the server is not trusted. This may be due to the certificate being expired, or the trust manager not being able to establish a chain of trust to any of the certificates in your trust store.

Answer 5

Check the the cert is valid, you can do this with your browser.

Answer 6

The problem you're having is with the certificates. Here is a list of things you might need to be familiar with before working with a secure SSL program. There must be a truststore, keystore, and the certs have to be added. To add the key to your cacerts file, as in step 6, the computer might ask you for a password that you don't know. It is "changeit" mostt likely

1) To create a new keystore and self-signed certificate with corresponding public/private keys:

 keytool -genkeypair -alias "username" -keyalg RSA -validity 7 -keystore keystore

2) To Examine the keystore:

keytool -list -v -keystore keystore

3) Export and examine the self-signed certificate:

keytool -export -alias "username" -keystore keystore -rfc -file "username".cer

4) Import the certificate into a new truststore:

keytool -import -alias "username" -file "username".cer -keystore truststore

5) Examine the truststore:

keytool -list -v -keystore truststore

6) Add to keystore (this is what your looking for):

sudo keytool -import -file "username".cer -alias "username" -keystore "path-to-keystore"

On some systems this is found in

/usr/lib/jvm/<java version folder>/jre/lib/security/cacerts

and on other systems it is something like

/etc/ssl/certs/java/cacerts

Check out this project on Git-Hub if you need more clarification: https://github.com/rabbitfighter81/JSSLInfoCollectionServer And here is a shell script that helps with keys. https://github.com/rabbitfighter81/SSLKeytool