--- a/src/java.base/share/classes/sun/security/ssl/PostHandshakeContext.java	Tue Jul 17 19:25:45 2018 +0300
+++ b/src/java.base/share/classes/sun/security/ssl/PostHandshakeContext.java	Tue Jul 17 13:04:40 2018 -0400
@@ -27,6 +27,7 @@
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
+import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
@@ -46,6 +47,9 @@
                 "Post-handshake not supported in " + negotiatedProtocol.name);
         }
 
+        this.localSupportedSignAlgs = new ArrayList<SignatureScheme>(
+            context.conSession.getLocalSupportedSignatureSchemes());
+
         handshakeConsumers = new LinkedHashMap<>(consumers);
         handshakeFinished = true;
     }