> For the complete documentation index, see [llms.txt](https://docs.sealights.io/knowledgebase/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sealights.io/knowledgebase/setup-and-configuration/troubleshooting-faq/java/ssl-certificate-errors/ssl-handshake-failure-java-7.md).

# SSL Handshake Failure (Java 7)

### Problem <a href="#problem" id="problem"></a>

In a Java 7 client environment, SSL handshake issues may be encountered while connecting to Sealights showing errors similar to below:

\_\_*Caused by: javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)*\_"

{% hint style="info" %}
Sealights supports TLS 1.2 connections as described here: <https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/secure-connections-supported-viewer-protocols-ciphers.html>
{% endhint %}

### Solution <a href="#solution" id="solution"></a>

Take the following steps to better understand the environment between client and server:

1. Ensure the Java 7 client is using TLS 1.2 by adding `-Dhttps.protocols=TLSv1.2`
2. Enable SSL debug mode using `-Djavax.net.debug=ssl`in order to display and review the client and server cipher suites in use for the attempted connection
3. If needed, add TLS 1.2 ciphers to the Java 7 client environment using `-Dhttps.cipherSuites=<comma separated list of ciphers>` per the example below

-`Dhttps.cipherSuites=TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_128_GCM_SHA256`

### Related articles <a href="#related-articles" id="related-articles"></a>

* [NodeJS - JavaScript heap out of memory](/knowledgebase/setup-and-configuration/troubleshooting-faq/node-javascript/nodejs-javascript-heap-out-of-memory.md) (NodeJS)
* [Agents Connectivity](/knowledgebase/setup-and-configuration/troubleshooting-faq/general/agents-connectivity.md#connectivity-check-agents-cannot-reach-sealights-platform-unreachable-network-errors)
* [Namespace: What to Configure?](/knowledgebase/setup-and-configuration/troubleshooting-faq/.net-.netcore/namespace-what-to-configure.md) (.Net / .NetCore)
* [Which Packages to Configure?](/knowledgebase/setup-and-configuration/troubleshooting-faq/java/which-packages-to-configure.md) (Java)
* [Linux .NETCore: Profiler Fails to Start](/knowledgebase/setup-and-configuration/troubleshooting-faq/.net-.netcore/linux-.netcore-profiler-fails-to-start.md)


---

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