SSLProtocolException: handshake alert: unrecognized_name
javax.net.ssl.SSLProtocolException: handshake alert: unrecognized_name
Após a instalação do Java 7u4 (antes utilizava o 6u29) no meu ambiente de desenvolvimento, algumas aplicações começaram a apresentar uma exceção. Essas aplicações estavam rodando no OC4J e funcionavam normalmente antes da atualização. O estranho é que eu não havia alterado nada nas aplicações, apenas atualizado a versão do Java.
O erro ocorria logo após eu logar no sistema único de acesso da empresa em que trabalho. Era exibida a seguinte exceção no console:
javax.net.ssl.SSLProtocolException: handshake alert: unrecognized_name at sun.security.ssl.ClientHandshaker.handshakeAlert(ClientHandshaker.java:1289) at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:1936) at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1059) at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1294) at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1321) at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1305) at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:515) at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1299) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
Pesquisando na Internet, verifiquei que o erro está relacionado com o Java Secure Socket Extension (JSSE), mais especificamente com o Server Name Indication (SNI).
Java Secure Socket Extension (JSSE)
O JSSE é um componente do JDK responsável por tornar as comunicações, entre servidores distintos, seguras. Utiliza os protocolos SSL (Secure Sockets Layer) e TLS (Transport Layer Security), incluindo funcionalidades de criptografia de dados, autenticação de clientes e servidores, integridade, entre outros. Ele é responsável por impedir que destinatários que não sejam os pretendidos acessem os dados indevidamente.
Server Name Indication (SNI)
SNI é uma extensão do TLS, definido na RFC 4366. Ele permite conexões TLS para servidores virtuais, em que vários servidores de nomes de rede diferentes estão hospedados em um único endereço de rede subjacente.
Alguns servidores SSL/TLS não suportam as extensões do SNI, nesse caso deveremos desabilitar essa extensão conforme mostrarei a seguir.
Porque ocorre o erro “unrecognized_name”?
Esse erro ocorre por conta da seguinte regra encontrada na especificação do TLS:
If the server understood the client hello extension but does not recognize the server name, it SHOULD send an "unrecognized_name" alert (which MAY be fatal).
Ou seja, o TLS envia um alerta se os servidores que estão se comunicando não forem reconhecidos entre si. Pelo que eu entendi, a especificação diz que a mensagem PODER SER fatal. Acredito que a partir da versão 7 do Java ele entrou nesse “parênteses”. 🙂
Resolvendo o problema
Existem três formas de solucionar esse problema:
- Desabilitando a extensão SNI;
- Utilizando apenas SSL3;
- Configurando o servidor-cliente para reconhecer o servidor ao qual ele deseja se comunicar.
Como estou utilizando minha máquina apenas para ambiente de desenvolvimento, optei pela primeira opção, desabilitando a extensão SNI através do parâmetro jsse.enableSNIExtension setado para false. Como utilizo o Eclipse, abri a aba Servers, cliquei duas vezes na cofiguração do meu servidor e depois em Open launch configuration. Na aba Arguments, em VM arguments, basta informar o código -Djsse.enableSNIExtension=false, conforme imagem abaixo:
Se você souber alguma outra forma de resolver o problema de handshake alert: unrecognized_name, comente abaixo.
Boa sorte.
11 Replies to “SSLProtocolException: handshake alert: unrecognized_name”
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The raised body mass index and high‐protein diets of many anabolic androgenic steroid users enhance susceptibility to
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Low testosterone ranges can cause testicular atrophy as a end result of
decreased sperm production. Our patients sometimes comment
that Dianabol reduces their appetite, which is as a outcome of pressure on the liver.
Each time you eat food, the liver has to digest it; thus, when taking hepatotoxic
steroids and eating massive quantities of food, the liver is changing into increasingly taxed.
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suppress the person’s urge for food (as a self-defense
mechanism), decreasing food consumption. This is why we make
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Its anabolic properties make it engaging for these trying to bulk up rapidly.
Nonetheless, this steroid works by enhancing protein synthesis, leading to
important muscle progress while also introducing undesirable unwanted facet effects.
One of the necessary thing sights of Dianabol is the fast
results it delivers.
In these cases, Dbol may be unknowingly used, and
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With one thing as highly effective as Dianabol, there’ll
at all times be negative comments and experiences guys are talking about.
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Even a rise of 5mg every day can take your unwanted effects to
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difficult to mitigate. We saw this old-school combination improve anabolism, with Proviron working
as a synergistic agent (increasing Dianabol’s effects).
Dianabol may also kick in quicker than some testosterone esters (such as cypionate
and enanthate), which have considerably longer half-lives.
Thus, we find Dianabol produces higher results in the early levels of
a cycle.
Expired Dianabol shouldn’t be used as it might have degraded and may doubtlessly cause hurt.
Some individuals may expertise sleep disturbances while using Dianabol,
together with insomnia or disrupted sleep patterns.
Establishing a consistent sleep routine, creating a sleep-friendly surroundings, and avoiding stimulants might help alleviate this side impact.
If you start to expertise any of these unwanted aspect effects, it’s
essential to talk to your physician immediately. They might help you determine whether or not the drug is causing the problem and what you can do about it.
People used to use Dianabol in their cycle to extend the body’s
capacity to shortly develop lean mass and strength instead of executing
a bodybuilding cycle that leads to little to no gain. Users might not want to endure hepatotoxicity from Dianabol for eight or 12 weeks.
Dianabol can additionally be used with other steroids,
such as Tren, to supply extra pronounced and advanced outcomes.
Dianabol is usually favored during bulking cycles when the primary goal is to maximize muscle mass and
energy positive aspects. It is an optimal choice
for individuals looking to endure vital body transformation and increase overall measurement.
On the opposite hand, Anavar is usually used throughout slicing cycles to
protect muscle mass while selling a lean and defined physique.
If your aim is to realize a extra toned and shredded appearance without substantial
muscle mass gains, Anavar may be the better possibility.
Black market pharmaceutical Deca-Durabolin exists, but you need to ensure you’re not buying counterfeit
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nasty unwanted side effects. PCT should begin two weeks after the end of the cycle, and Clomid ought to be used for three weeks
at 50mg every day or up to 100mg daily in case your cycle is heavier.
Not solely these steroids will assist your muscle strength and gain, but may even improve your stamina
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some fluid retention, but it should not be as severe as you
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