Hello, Anybody have any clue what could be causing this "silent exception" when DEBUG level logging is used, to SP's log. IOException is written to log all the time. Thus SAML authentication is working ok / normally. Using SSL (https) public addresses both with IDP and SP, along with signed & encrypted SAML assertions. Public certificates are good and ok! 2016-04-19 13:25:26,441 DEBUG [io.undertow.request.io] (default I/O-8) UT005013: An IOException occurred: java.io.IOException: javax.net.ssl.SSLException: Inbound closed before receiving peer's close_notify: possible truncation attack? at io.undertow.protocols.ssl.SslConduit.notifyReadClosed(SslConduit.java:577) at io.undertow.protocols.ssl.SslConduit.terminateReads(SslConduit.java:178) at org.xnio.conduits.ConduitStreamSourceChannel.close(ConduitStreamSourceChannel.java:168) at org.xnio.IoUtils.safeClose(IoUtils.java:134) at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.forceTermination(ReadReadyHandler.java:58) at io.undertow.protocols.ssl.SslConduit$SslReadReadyHandler.forceTermination(SslConduit.java:1091) at org.xnio.nio.NioSocketConduit.forceTermination(NioSocketConduit.java:105) at org.xnio.nio.WorkerThread.run(WorkerThread.java:492) Caused by: javax.net.ssl.SSLException: Inbound closed before receiving peer's close_notify: possible truncation attack? at sun.security.ssl.Alerts.getSSLException(Alerts.java:208) at sun.security.ssl.SSLEngineImpl.fatal(SSLEngineImpl.java:1666) at sun.security.ssl.SSLEngineImpl.fatal(SSLEngineImpl.java:1634) at sun.security.ssl.SSLEngineImpl.closeInbound(SSLEngineImpl.java:1561) at io.undertow.protocols.ssl.SslConduit.notifyReadClosed(SslConduit.java:575) ... 7 more ________________________________ Tämä sähköpostiviesti (liitteineen) saattaa sisältää luottamuksellista tietoa, joka on tarkoitettu vain vastaanottajalleen. Jos et ole oikea vastaanottaja, ilmoita viestin lähettäjälle tapahtuneesta virheestä ja tuhoa viesti välittömästi. Viestin luvaton julkaiseminen, kopioiminen, jakelu tai muu käyttö tai toimenpiteisiin ryhtyminen sen perusteella on ehdottomasti kielletty. This message (including any attachments) may contain confidential information intended for the person or entity to which it is addressed. If you are not the intended recipient, notify the sender and delete this message immediately. Notice that disclosing, copying, distributing or any other use of the message and its information, or taking any action based on it, is strictly prohibited. ________________________________