if sub server cannot be bound, log it as warning

platform/platform-impl/src/org/jetbrains/io/NettyUtil.java

@@ -33,6 +33,7 @@ import org.jetbrains.annotations.Nullable;
 import org.jetbrains.ide.PooledThreadExecutor;
 
 import java.io.IOException;
+import java.net.BindException;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 
@@ -93,7 +94,8 @@ public final class NettyUtil {
     }
 
     return (throwable instanceof IOException && message.equals("An existing connection was forcibly closed by the remote host")) ||
-           (throwable instanceof ChannelException && message.startsWith("Failed to bind to: "));
+           (throwable instanceof ChannelException && message.startsWith("Failed to bind to: ")) ||
+           throwable instanceof BindException;
   }
 
   // applicable only in case of ClientBootstrap&OioClientSocketChannelFactory

platform/platform-impl/src/org/jetbrains/io/SubServer.java

@@ -47,8 +47,12 @@ final class SubServer implements CustomPortServerManager.CustomPortService, Disp
       return true;
     }
     catch (Exception e) {
-      NettyUtil.log(e, BuiltInServer.LOG);
-      user.cannotBind(e, port);
+      try {
+        NettyUtil.log(e, BuiltInServer.LOG);
+      }
+      finally {
+        user.cannotBind(e, port);
+      }
       return false;
     }
   }