--- a/java/org/apache/tomcat/util/net/NioChannel.java	
+++ a/java/org/apache/tomcat/util/net/NioChannel.java	
@@ -120,6 +120,8 @@ public class NioChannel implements ByteChannel{
      */
     @Override
     public int write(ByteBuffer src) throws IOException {
+        // fix BZ 56518, clear thread interrupted status before write to NIO socket.
+        Thread.interrupted();
         return sc.write(src);
     }
 
--- a/java/org/apache/tomcat/util/net/SecureNioChannel.java	
+++ a/java/org/apache/tomcat/util/net/SecureNioChannel.java	
@@ -471,6 +471,8 @@ public class SecureNioChannel extends NioChannel  {
      */
     @Override
     public int write(ByteBuffer src) throws IOException {
+        // fix BZ 56518, clear thread interrupted status before write to NIO socket.
+        Thread.interrupted();
         if ( src == this.netOutBuffer ) {
             //we can get here through a recursive call
             //by using the NioBlockingSelector