[ 
https://issues.apache.org/jira/browse/HTTPCLIENT-1262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499894#comment-13499894
 ] 

Sebb commented on HTTPCLIENT-1262:
----------------------------------

Perhaps the site behaves differently for diffierent User-Agent strings?

IE 8 reports:

>>
There is a problem with this website's security certificate. 
    
The security certificate presented by this website was not issued by a trusted 
certificate authority.
The security certificate presented by this website was issued for a different 
website's address.

Security certificate problems may indicate an attempt to fool you or intercept 
any data you send to the server.  
We recommend that you close this webpage and do not continue to this website.  
<<

Try changing the UA string in HC and see if that helps. 
                
> Weird SSL issue (peer not authenticated) [www.popcornopolis.com]
> ----------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1262
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1262
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpAuth, HttpClient
>    Affects Versions: 4.2.2
>         Environment: JDK 1.6, Mac OS X 10.{6,8}, Ubuntu
>            Reporter: Cédric Chantepie
>            Priority: Trivial
>              Labels: pki, ssl
>         Attachments: curl.dump, java.dump, ssl-ca-chain.png
>
>
> Try to request some HTTPS websites, we get 'PKIX path building failed' error.
> Seems it's about intermediate/chain certificate.
> Exception in thread "main" javax.net.ssl.SSLHandshakeException: 
> sun.security.validator.ValidatorException: PKIX path building failed: 
> sun.security.provider.certpath.SunCertPathBuilderException: unable to find 
> valid certification path to requested target
> at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174)
> at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1764)
> at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:241)
> at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:235)
> at 
> com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1206)
> at 
> com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:136)
> at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:593)
> at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:529)
> at 
> com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:958)
> at 
> com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1203)
> at 
> com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:654)
> at 
> com.sun.net.ssl.internal.ssl.AppOutputStream.write(AppOutputStream.java:100)
> at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
> at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
> at 
> org.jirafe.shaded.httpclient.HttpConnection.flushRequestOutputStream(HttpConnection.java:828)
> at 
> org.jirafe.shaded.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:2116)
> at 
> org.jirafe.shaded.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1096)
> at 
> org.jirafe.shaded.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
> at 
> org.jirafe.shaded.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
> at org.jirafe.shaded.httpclient.HttpClient.executeMethod(HttpClient.java:397)
> at org.jirafe.shaded.httpclient.HttpClient.executeMethod(HttpClient.java:323)
> at Test.main(Test.java:22)
> Caused by: sun.security.validator.ValidatorException: PKIX path building 
> failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to 
> find valid certification path to requested target
> at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:323)
> at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:217)
> at sun.security.validator.Validator.validate(Validator.java:218)
> at 
> com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:126)
> at 
> com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:209)
> at 
> com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:249)
> at 
> com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1185)
> ... 17 more
> Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable 
> to find valid certification path to requested target
> at 
> sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:174)
> at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:238)
> at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:318)
> ... 23 more

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