Hi Team,

We are successfully running CAS 3.5.2 with authentication with Facebook, 
Google+ and Twitter in prod environment.
and suddenly we are getting below error in our server log file for twitter 
login. Facebook and Google+ is working fine.

We didn't change any setting in prod environment. and we are not using https.

Any hint will be greatly appreciated.

org.scribe.exceptions.OAuthConnectionException: There was a problem while 
creating a connection to the remote service.
        at org.scribe.model.ProxyRequest.send(ProxyRequest.java:86)
        at org.scribe.model.ProxyOAuthRequest.send(ProxyOAuthRequest.java:43)
        at 
org.scribe.up.addon_to_scribe.ProxyOAuth10aServiceImpl.getRequestToken(ProxyOAuth10aServiceImpl.java:67)
        at 
org.scribe.up.provider.BaseOAuth10Provider.getAuthorizationUrl(BaseOAuth10Provider.java:56)
        at 
org.jasig.cas.support.oauth.web.OAuth10LoginController.handleRequestInternal(OAuth10LoginController.java:55)
        at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
        at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
        at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:669)
        at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:574)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
        at 
org.jasig.cas.web.init.SafeDispatcherServlet.service_aroundBody2(SafeDispatcherServlet.java:128)
        at 
org.jasig.cas.web.init.SafeDispatcherServlet.service_aroundBody3$advice(SafeDispatcherServlet.java:57)
        at 
org.jasig.cas.web.init.SafeDispatcherServlet.service(SafeDispatcherServlet.java:1)
        at 
org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:333)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
        at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
        at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at 
com.github.inspektr.common.web.ClientInfoThreadLocalFilter.doFilter(ClientInfoThreadLocalFilter.java:63)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:313)
        at 
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
        at 
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at 
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
        at 
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
        at 
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at 
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
        at 
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
        at 
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at 
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
        at 
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093)
        at 
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:291)
        at 
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:666)
        at 
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:597)
        at 
com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:872)
        at 
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
        at 
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
        at 
com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
        at 
com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:264)
        at 
com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
Caused by: 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:1623)
        at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:198)
        at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:192)
        at 
com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1074)
        at 
com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:128)
        at 
com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:529)
        at 
com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:465)
        at 
com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:884)
        at 
com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1120)
        at 
com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1147)
        at 
com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1131)
        at 
sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:434)
        at 
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:166)
        at 
sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:904)
        at 
sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:230)
        at org.scribe.model.ProxyRequest.addBody(ProxyRequest.java:142)
        at org.scribe.model.ProxyRequest.doSend(ProxyRequest.java:124)
        at org.scribe.model.ProxyRequest.send(ProxyRequest.java:84)
        ... 53 more

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