Unrecognized SSL message plaintext connection Exception

Question

I have a java complied package to speak with the https server on net  Running the compilation gives the following exception   javax net ssl SSLException  Unrecognized SSL message  plaintext connection      at com sun net ssl internal ssl InputRecord handleUnknownRecord Unknown Source  at com sun net ssl internal ssl InputRecord read Unknown Source  at com sun net ssl internal ssl SSLSocketImpl readRecord Unknown Source  at com sun net ssl internal ssl SSLSocketImpl performInitialHandshake Unknown Source  at com sun net ssl internal ssl SSLSocketImpl startHandshake Unknown Source  at com sun net ssl internal ssl SSLSocketImpl startHandshake Unknown Source  at sun net www protocol https HttpsClient afterConnect Unknown Source  at sun net www protocol https AbstractDelegateHttpsURLConnection connect Unknown Source  at sun net www protocol https HttpsURLConnectionImpl connect Unknown Source    I think this is due to the connection established with the client machine is not secure   Is there any way to configure the local machine or ports in order to connect to the remote https server

User · Answer

HERE A VERY IMPORTANT ANSWER   You just change your API URL String  in your method  from https to http   This could also be the cause   client resource  http   192 168 0 100 8023 jaxrs tester tester      instead of  client resource  https   192 168 0 100 8023 jaxrs tester tester

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As EJP said  it s a message shown because of a call to a non-https protocol  If you are sure it is HTTPS  check your bypass proxy settings  and in case add your webservice host url to the bypass proxy list

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If you re running the Java process from the command line on Java 6 or earlier  adding this switch solved the issue above for me   -Dhttps protocols  TLSv1

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If you are running local using spring i d suggest use    Bean public AmazonDynamoDB amazonDynamoDB   throws IOException       return AmazonDynamoDBClientBuilder standard                withCredentials                      new AWSStaticCredentialsProvider                              new BasicAWSCredentials  fake    credencial                                                    withClientConfiguration new ClientConfigurationFactory   getConfig   withProtocol Protocol HTTP                withEndpointConfiguration new AwsClientBuilder EndpointConfiguration  localhost 8443    central                 build        It works for me using unit test   Hope it s help

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Adding this as an answer as it might help someone later   I had to force jvm to use the IPv4 stack to resolve the error  My application used to work within company network  but while connecting from home it gave the same exception  No proxy involved  Added the jvm argument     -Djava net preferIPv4Stack true and all the https requests were behaving normally

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I got the same error message when I forgot to log in to the company firewall  before performing a POST request through a proxy

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I think this is due to the connection   established with the client machine is   not secure    It is due to the fact that you are talking to an HTTP server  not an HTTPS server  Probably you didn t use the correct port number for HTTPS

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In case you are running   Cisco AnyConnect Secure Mobility Agent  Cisco AnyConnect Web Security Agent   try stopping the service s    Not sure why I got a down vote for this answer  In our corporate network this IS the solution to the issue

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Maybe your default cerficate has expired  to renew it through admin console go  Security  SSL certificate and key management   Key stores and certificates   NodeDefaultKeyStore   Personal certificates   select the  default  alias and click on  renew  after then restart WAS

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javax net ssl SSLException  Unrecognized SSL message  plaintext connection    You should have a local SMTP domain name that will contact the mail server and establishes a new connection as well you should change the SSL property in your programming below   javax net ssl SSLException  Unrecognized SSL message  plaintext connection   props put  mail smtp socketFactory fallback    true       Should be true

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Another reason is maybe  access denided   maybe you can t access to the URI and received blocking response page for internal network access  If you are not sure your application zone need firewall rule  you try to connect from terminal command line   For GNU Linux or Unix  you can try run like this command and see result is coming from blocking rule or really remote address  echo   nc -v yazilimcity net 443

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i solved my problem using port 25 and Following prop  mailSender javaMailProperties putAll                    mail smtp auth    true                    mail smtp starttls enable    false                    mail smtp ssl enable    false                    mail smtp socketFactory fallback    true

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if connection is FTPS test   FTPSClient ftpClient   new FTPSClient protocol  false    protocol   TLS SSL and false   isImplicit

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It worked for me now  I have change the setting of my google account as below                 System out println  Start            final String username    myemail gmail com           final String password                            Properties props   new Properties            props put  mail smtp auth    true            props put  mail smtp host    smtp gmail com            props put  mail smtp port    465            props put  mail transport protocol    smtp            props put  mail smtp starttls enable    true            props put  mail smtp starttls enable    true            props put  mail smtp socketFactory class    javax net ssl SSLSocketFactory              Session session   Session getInstance props                    new javax mail Authenticator                         protected PasswordAuthentication getPasswordAuthentication                             return new PasswordAuthentication username  password                                                         try               Transport transport session getTransport                Message message   new MimeMessage session               message setFrom new InternetAddress  myemail gmail com      formBean getString  fromEmail               message setRecipients Message RecipientType TO InternetAddress parse  myemail gmail com                 message setSubject  subject     formBean getString              message setText  mailBody                transport connect                transport send message  InternetAddress parse  myemail gmail com       message                System out println  Done               catch  MessagingException e                System out println  e   e               e printStackTrace                throw new RuntimeException e                Though I have enabled SSL and TSL while running program in this link of same post  I spend a lot of time but than I realized and found this link  And done 2 following steps and setting control in google       Disable the 2-step verification  password and OTP  Enabling to allow to access less secure app Allow less secure apps  ON     Now I am able to send mail using above program

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I ve got similar error using camel-mail component to send e-mails by gmail smtp    The solution was changing from TLS port  587  to SSL port  465  as below    lt route id  sendMail  gt     lt from uri  jason toEmail   gt     lt convertBodyTo type  java lang String   gt     lt setHeader headerName  Subject  gt  lt constant gt Something lt  constant gt  lt  setHeader gt     lt to uri  smtps   smtp gmail com 465 username myemail gmail com amp amp password mypw amp amp to someemail gmail com amp amp debugMode true amp amp mail smtp starttls enable true   gt   lt  route gt

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I face the same issue from Java application built in Jdevelopr 11 1 1 7 IDE  I solved the issue by unchecking the use of proxy form Project properties   You can find it in the following  Project Properties -   from left panle  Run Debug Profile - Click  edit  form the right panel -  Tool Setting from the left panel -  uncheck  Use Proxy  option

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I got the same error  it was because I was accessing the https port using http   The issue solved when I changed http to https

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I got the same issue and it got resolved by setting  proxyUser  and  proxyPassword  in system properties   System setProperty  http proxyUser   PROXY USER   System setProperty  http proxyPassword   PROXY PASSWORD     along with  proxyHost  and  proxyPort   System setProperty  http proxyHost   PROXY ADDRESS   System setProperty  http proxyPort   PROXY PORT     Hope it will work

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I was facing this exception when using Gmail   In order to use Gmail I had to turn ON  Allow less secure apps    This Gmail setting can be found at https   www google com settings security lesssecureapps after login the gmail account

[java] Unrecognized SSL message, plaintext connection? Exception

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