The SSLHandshakeException is thrown when an error occurs while a client and server connection fails to agree on their desired security level. This exception is one of a handful of classes that inherits from the parent SSLException class.
All Java errors implement the java. Throwable interface, or are extended from another inherited class therein.
Java Exception Handling – SSLHandshakeException
The full exception hierarchy of this error is:. This code sample also uses the Logging utility class, the source of which can be found here on GitHub. Regardless, many modern code bases, languages, documents, and articles including this one continue to refer to this protocol as SSL, since both terms are commonly used interchangeably. An SSL connection is established between a client and server using the common practice of public-key cryptography.
Essentially, a pair of keys are created that are uniquely linked to one another through mathematical algorithms.
One key is known only by the server as is known as the private keywhile the other key is known to everyone, including the client, and is known as the public key. Each key can only perform a transformation of data in one direction. Thus, the public key is only capable of encrypting data, while the private key is only capable of decrypting data.
Since only one key is publicly available, and yet both keys are required to successfully transmit, encrypt, and then decrypt data, a secure connection and exchange of information is established, so long as the client trusts the server.
This last point is critical and where an SSL certificate comes into the picture.
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You can even view the details of the certificate. Most organizations just use their base domain name e. This is where a certificate authority comes in, which is a third-party that issues SSL certificates. There are a handful of trusted authorities out there that issue certificates, and these authorities are used to authenticate the signature that is claimed on each SSL certificate they have issued.
For example, the current airbrake. For no particular reason we start with the SSLServer class:. Most of the logic occurs in the createServer int port method, where we get the default SSLServerSocketFactory instance, then try creating a ServerSocket using the passed port. A continuous loop is then used to accept incoming connections, process the incoming information, and output the result to the client.
You may also notice that the SSLServer class implements the Runnable interface, which includes the run method. This interface allows us to pass an instance of this class to a new Thread instance, so we can create a server in a separate thread. We then attempt to create and connect to the socket of the specified host and portafter which we prompt the user for input to pass to the server. Again, implementation of the Runnable interface allows us to execute the run method on a unique thread.
With both the client and server set up we can test things out in our Main. Executing this code produces the following output:. Creating a self-signed certificate for Java involves using the keytool command. For now, we can start by generating a new key and storing it in a local keystore file:. Now we want to import the certificate into the truststore. The best way to think of the difference between a keystore and truststore is that the keystore is used for private keyswhile the truststore is for public certificates.Comment 1.
The infamous Java exception javax. What it wants to say is, most likely, something like this:. You will now learn how to find out what is the case. We will first find out what both the server and the JVM support and compare it to see where they disagree.
Feel free to just skim through the outputs and return to them later after they were explained. Here we see that the server only supports TLS version 1.
Now we will find out what the JVM supports I did that through Clojure but you could have just as well used Java directly; notice the javax. But they fail to agree on the TLS version, since the server requires v1.
You can either configure the server to support a cipher suite and protocol version that the JVM has or teach JVM to use what the server wants. In my cases that was resolved by running java with -Dhttps. See the original article here.
Performance Zone. Over a million developers have joined DZone. Let's be friends:. Troubleshooting javax.
DZone 's Guide to. Learn how to troubleshoot this infamous Java exception to see where the problem lies and find a solution. Free Resource. Like 4. Join the DZone community and get the full member experience. Join For Free. What Does the Server Support? We will use nmap for that brew install nmap on OSX : map --script ssl-enum-ciphers -p my-server.
What's Wrong? The Solution You can either configure the server to support a cipher suite and protocol version that the JVM has or teach JVM to use what the server wants. Like This Article? Troubleshooting the Performance of Vert.
Opinions expressed by DZone contributors are their own. Performance Partner Resources.TLS Transport Layer Security, whose predecessor is SSL is the standard security technology for establishing an encrypted link between a web server and a web client, such as a browser or an app. During this process, the client and server:. See also Understanding northbound and southbound connections.
Diagnosis Determine whether the error occurred at the northbound or southbound connection. For further guidance on making this determination, see Determining the source of the problem. Run the tcpdump utility to gather further information: If you are a Private Cloud userthen you can collect the tcpdump data at the relevant client or server.
A client can be the client app for incoming, or northbound connections or the Message Processor for outgoing, or southbound connections. A server can be the Edge Router for incoming, or northbound connections or the backend server for outgoing, or southbound connections based on your determination from Step 1.
If you are a Public Cloud userthen you can collect the tcpdump data only on the client app for incoming, or northbound connections or the backend server for outgoing, or southbound connectionsbecause you do not have access to the Edge Router or Message Processor. Analyze the tcpdump data using the Wireshark tool or a similar tool. Message 4 in the tcpdump output below shows that the Message Processor Source sent a "Client Hello" message to the backend server Destination.
SSL handshake fails when connecting from Java client on Windows
If the backend server does not support the TLSv1. The message 4 in the tcpdump output below shows that the client application source sent a "Client Hello" message to the Edge Router destination. However, the Edge router still sends the Fatal Alert: Handshake Failure to the client application as shown in the screenshot below:.
You must ensure that the client uses the cipher suite algorithms that are supported by the server. To solve the issue described in the previous Diagnosis section, download and install the Java Cryptography Extension JCE package and include it in the Java installation to support High Encryption cipher suite algorithms. If the problem is northboundthen you may see different error messages depending on the underlying cause. The following sections list example error messages and the steps to diagnose and resolve this issue.
Here's a sample error message that you might see when you call an API proxy:. The subject name in the primary certificate has the CN as something. Keystores and Truststores.
Sample intermediate and root certificate where issuer and subject do not match. Sample tcpdump showing Certificate Unknown error. To resolve the issue identified in the example above, upload the valid backend server's certificate to the trustore on the Message Processor.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. For security reasons we do no have access to 3rd party url or service, its only our client can access from there environment. I have imported these certificates in the javakeystore cacertseven in the weblogic keystores demotrust. I have tried different combination of importing the certificate in keystore, i can see the entry of teh certificate in the keystore as well.
I have properly converted from. We were also facing same issue. We were trying to connect 3rd party server installed with SSL certificate of encryption. When we were trying to connect it from java v1. To install certificate in your keystore you can use following command keytool -import -trustcacerts -keystore cacerts -storepass changeit -noprompt -alias helloroot -file hello.
After doing above steps issue was persists then we come to know about TLSv1. We were using java 1. We forced grails to use TLSv1.
There are following ways to force grails to use TLSv1. The same was resolved by adding the certificates to cacerts file and pointing the same to weblogic.
Intially certificates chain was not properly imported into cacerts file. Learn more. Asked 8 years, 1 month ago. Active 2 years ago. Viewed 3k times. I have done enough hit and trial but still not succeeded. Our application is running on Weblogic 9. I think if we resolve this issue, then application will also run.
Application runs fine on http, but on https it gives SSL handshake failure error. Am i missing any steps, please let me know. Ryan Ransford 3, 25 25 silver badges 33 33 bronze badges.
Ankur Singhal Ankur Singhal Can you not ask the 3rd party what is going wrong? I would assume you're not their only client. Is the 3rd party certificate signed by a know Certificate Authority? If it's self-signed Java will not use it unless you also add the CA certificate to the keystore. There are actually 3 certificate, i guess one will be root CA, the other will be internediate CA. I tried importing separately as well as together, but no success.
Active Oldest Votes. Satish Sojitra Satish Sojitra 5 5 silver badges 17 17 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.With recent emphasis on encrypted communications, I will cover the way in which the JDK evolves regarding protocols, algorithms, and changes, as well as some advanced diagnostics to better understand TLS connections like HTTPS.
Most developers will not have to do this level of diagnosis in the process of writing or running applications. In the event that you do, the following information should provide enough information to understand what's happening within secure connections. For the last 15 years sincethe Java platform has evolved through the Java Community Process where companies, organizations, and dedicated individuals develop and vote on specifications to determine what makes up the Java Platform.
Much of the efforts are centered on compatibility, like the TCK, ensuring that different implementations are compatible with each-other and that developers can predict how their applications will run. We are not changing critical default options like TLS protocol within minor versions. I will post the code here with the intent focused on tuning and understanding the underlying capabilities.
One in particular is a View My Client page, which will display information about the client connection. By integrating with that page, I was able to control the implementation as I used different Java tuning parameters. You can find the code in the appendix. When diagnosing TLS-related issues, there are a number of helpful system properties. For older versions, this can update the default in case your Java 7 client wants to use TLS 1.
Example: -Dhttps. Most developers will not need an explicit catch, but it may help you more easily diagnose the cause of any IOException. When applying the -Djavax. In the case above, the failure occurred during the handshake. The most likely cause for that is algorithm support. In this particular case, replacing those policy files within JDK 7 allows it to use the stronger variants of existing algorithms and connect successfully.
To test configurations, run this like:. The final keyword is technically unnecessary here, it's more a habit of my coding style. Final means that the variable can't be re-assigned later through an equals. That way when I come back to read the code a few months later, I don't have to mentally keep track of which variables change.
Or if I go to make edits, I don't accidentally change something without understanding the impact. Thank you for asking. On older entries, the comments close after a month or two. I'd rather keep the comments here directed towards the post topic. If you want to post a question on a site like ServerFault, I can take a look at it. In day-to-day situations Japan uses the same calendar as most of the world, according to which we are currently in the year of the Build, test and deploy on Oracle Apps.
Start Now. July 2, Guest Author. Stability: The evolution of protocols and algorithms For the last 15 years sincethe Java platform has evolved through the Java Community Process where companies, organizations, and dedicated individuals develop and vote on specifications to determine what makes up the Java Platform. Example: -Djavax.
Example: -Djdk. Modifying this will handle cases where the receiving party responds differently based on the user-agent. Example: -Dhttp. Example: -Djava. Many other protocols and properties can be found within the following areas: Java Networking and Proxies.Comment 8.
In most of these projects, either during testing, or setting up a new environment, I've run into various SSL configuration errors that often resulted in a rather uncomprehensive error such as:. In most of the cases it was misconfiguration where keystores didn't containt the correct certificates, the certificate chain was incomplete or the client didn't supply a valid certificate.
So in the last project I decided to document what was happening and what caused specific errors during the SSL handshake. In this article I'll show you why specific SSL errors occur, how you can detect them by analyzing the handshake information, and how to solve them. For this I use the following scenario:. Not a very complicated situation, but one you often see. Note that the following information can also be used to identify problems when you don't work with client certificates or use self-signed certificates.
The way to determine the problem in those cases, is pretty much the same.
First we'll look at the happy flow, what happens in the handshake when we use client certificates. We won't look at the complete negotiation phase, but only until both the client and the server have exchanged their certificates and have validated the received certificate. If everything goes well until that point, the rest should work. The following is what you see when you run the client and the server using the java VM parameter: -Djavax.
The first thing that happens is that the client sends a ClientHello message using the TLS protocol version he supports, a random number and a list of suggested cipher suites and compression methods. From our client this looks like this:. The server responds, very originally, with a ServerHello message, that contains the choices made based on the information provided by the client another random number and optionally a session id.
The next step is also done by the server.
How to Analyze Java SSL Errors
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I always get a handshake error. Or you could use analyze. Learn more. Asked 5 years, 1 month ago. Active 5 years, 1 month ago. Viewed 9k times. Btw, all other web servers work fine. So it's probably not related to my code.
Any ideas? The output with option "javax. Enzo Matrix. Enzo Matrix Enzo Matrix 43 1 1 silver badge 4 4 bronze badges. Have you tried by enabling all the supported protocols and not just TLSv1.
First I used defaults with all protocols enabled. Doesn't work either. I found this solution here. That's why I restricted protocols and hoped it would help. Active Oldest Votes.
Steffen Ullrich Steffen Ullrich Thanks so much for pointing out this new SNI extension. This really solved the problem. Any hints for a non-perler?