diff --git a/examples/basic.rs b/examples/basic.rs
index 4e2039ca..5bbd529c 100644
--- a/examples/basic.rs
+++ b/examples/basic.rs
@@ -9,11 +9,11 @@ extern crate tokio_io;
 extern crate tokio_openssl;
 extern crate tokio_tcp;
 
+use std::fmt;
 use std::sync::{
     atomic::{AtomicUsize, Ordering},
     Arc,
 };
-use std::{fmt, io};
 
 use futures::{future, Future};
 use openssl::ssl::{SslAcceptor, SslFiletype, SslMethod};
@@ -25,7 +25,7 @@ use actix_net::{IntoNewService, NewServiceExt, Server};
 /// Simple logger service, it just prints fact of the new connections
 fn logger<T: AsyncRead + AsyncWrite + fmt::Debug>(
     stream: T,
-) -> impl Future<Item = T, Error = io::Error> {
+) -> impl Future<Item = T, Error = ()> {
     println!("New connection: {:?}", stream);
     future::ok(stream)
 }
@@ -40,7 +40,7 @@ struct ServiceState {
 /// Service function for our stateful service
 fn service<T: AsyncRead + AsyncWrite>(
     st: &mut ServiceState, _stream: T,
-) -> impl Future<Item = (), Error = io::Error> {
+) -> impl Future<Item = (), Error = ()> {
     let num = st.num.fetch_add(1, Ordering::Relaxed);
     println!("got ssl connection {:?}", num);
     future::ok(())
@@ -75,7 +75,7 @@ fn main() {
                 // service for converting incoming TcpStream to a SslStream<TcpStream>
                 (move |stream| {
                 SslAcceptorExt::accept_async(&acceptor, stream)
-                    .map_err(|e| io::Error::new(io::ErrorKind::Other, e))
+                    .map_err(|e| println!("Openssl error: {}", e))
             })
             // convert closure to a `NewService`
             .into_new_service()
@@ -89,7 +89,7 @@ fn main() {
             // actix-net generates `NewService` impl that creates `ServiceState` instance for each new service
             // and use `service` function as `Service::call`
             .and_then((service, move || {
-                Ok::<_, io::Error>(ServiceState { num: num.clone() })
+                Ok(ServiceState { num: num.clone() })
             }))
             },
         ).unwrap()
diff --git a/examples/ssl.rs b/examples/ssl.rs
index 04ebe22d..0f8043d1 100644
--- a/examples/ssl.rs
+++ b/examples/ssl.rs
@@ -5,7 +5,6 @@ extern crate openssl;
 extern crate tokio_io;
 extern crate tokio_tcp;
 
-use std::io;
 use std::sync::{
     atomic::{AtomicUsize, Ordering},
     Arc,
@@ -24,7 +23,7 @@ struct ServiceState {
 
 fn service<T: AsyncRead + AsyncWrite>(
     st: &mut ServiceState, _: T,
-) -> impl Future<Item = (), Error = io::Error> {
+) -> impl Future<Item = (), Error = ()> {
     let num = st.num.fetch_add(1, Ordering::Relaxed);
     println!("got ssl connection {:?}", num);
     future::ok(())
@@ -43,7 +42,7 @@ fn main() {
         .unwrap();
 
     let num = Arc::new(AtomicUsize::new(0));
-    let openssl = ssl::OpensslAcceptor::new(builder);
+    let openssl = ssl::OpensslAcceptor::new(builder.build());
 
     // server start mutiple workers, it runs supplied `Fn` in each worker.
     Server::default()
@@ -53,10 +52,8 @@ fn main() {
             // configure service
             openssl
                 .clone()
-                .map_err(|e| io::Error::new(io::ErrorKind::Other, e))
-                .and_then((service, move || {
-                    Ok::<_, io::Error>(ServiceState { num: num.clone() })
-                }))
+                .map_err(|e| println!("Openssl error: {}", e))
+                .and_then((service, move || Ok(ServiceState { num: num.clone() })))
         }).unwrap()
         .start();
 
diff --git a/src/server.rs b/src/server.rs
index 9bc8774a..a968efa9 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -5,17 +5,17 @@ use futures::sync::{mpsc, mpsc::unbounded};
 use futures::{Future, Sink, Stream};
 use net2::TcpBuilder;
 use num_cpus;
-use tokio_tcp::TcpStream;
 
 use actix::{
     actors::signal, fut, Actor, ActorFuture, Addr, Arbiter, AsyncContext, Context, Handler,
     Response, StreamHandler, System, WrapFuture,
 };
 
+pub use super::server_service::ServerServiceFactory;
+
 use super::accept::{AcceptLoop, AcceptNotify, Command};
-use super::server_service::{ServerNewService, ServerServiceFactory};
+use super::server_service::{InternalServerServiceFactory, ServerNewService};
 use super::worker::{self, Conn, StopWorker, Worker, WorkerAvailability, WorkerClient};
-use super::NewService;
 use super::{PauseServer, ResumeServer, StopServer, Token};
 
 pub(crate) enum ServerCommand {
@@ -26,7 +26,7 @@ pub(crate) enum ServerCommand {
 pub struct Server {
     threads: usize,
     workers: Vec<(usize, Addr<Worker>)>,
-    services: Vec<Box<ServerServiceFactory + Send>>,
+    services: Vec<Box<InternalServerServiceFactory>>,
     sockets: Vec<(Token, net::TcpListener)>,
     accept: AcceptLoop,
     exit: bool,
@@ -143,13 +143,10 @@ impl Server {
     }
 
     /// Add new service to server
-    pub fn bind<F, U, N>(mut self, addr: U, factory: F) -> io::Result<Self>
+    pub fn bind<F, U>(mut self, addr: U, factory: F) -> io::Result<Self>
     where
-        F: Fn() -> N + Clone + Send + 'static,
+        F: ServerServiceFactory,
         U: net::ToSocketAddrs,
-        N: NewService<Request = TcpStream, Response = (), Error = (), InitError = ()> + 'static,
-        N::Service: 'static,
-        N::Future: 'static,
     {
         let sockets = bind_addr(addr)?;
 
@@ -160,12 +157,9 @@ impl Server {
     }
 
     /// Add new service to server
-    pub fn listen<F, N>(mut self, lst: net::TcpListener, factory: F) -> Self
+    pub fn listen<F>(mut self, lst: net::TcpListener, factory: F) -> Self
     where
-        F: Fn() -> N + Clone + Send + 'static,
-        N: NewService<Request = TcpStream, Response = (), Error = (), InitError = ()> + 'static,
-        N::Service: 'static,
-        N::Future: 'static,
+        F: ServerServiceFactory,
     {
         let token = Token(self.services.len());
         self.services.push(ServerNewService::create(factory));
@@ -254,7 +248,7 @@ impl Server {
         let (tx, rx) = unbounded::<Conn>();
         let avail = WorkerAvailability::new(notify);
         let worker = WorkerClient::new(idx, tx, avail.clone());
-        let services: Vec<Box<ServerServiceFactory + Send>> =
+        let services: Vec<Box<InternalServerServiceFactory>> =
             self.services.iter().map(|v| v.clone_factory()).collect();
 
         let addr = Arbiter::start(move |ctx: &mut Context<_>| {
diff --git a/src/server_service.rs b/src/server_service.rs
index 0bfad8df..0f197d82 100644
--- a/src/server_service.rs
+++ b/src/server_service.rs
@@ -65,54 +65,45 @@ where
     }
 }
 
-pub(crate) struct ServerNewService<F, T>
-where
-    F: Fn() -> T + Send + Clone,
-{
+pub(crate) struct ServerNewService<F: ServerServiceFactory> {
     inner: F,
 }
 
-impl<F, T> ServerNewService<F, T>
+impl<F> ServerNewService<F>
 where
-    F: Fn() -> T + Send + Clone + 'static,
-    T: NewService<Request = TcpStream, Response = (), Error = (), InitError = ()> + 'static,
-    T::Service: 'static,
-    T::Future: 'static,
+    F: ServerServiceFactory,
 {
-    pub(crate) fn create(inner: F) -> Box<ServerServiceFactory + Send> {
+    pub(crate) fn create(inner: F) -> Box<InternalServerServiceFactory> {
         Box::new(Self { inner })
     }
 }
 
-pub trait ServerServiceFactory {
-    fn clone_factory(&self) -> Box<ServerServiceFactory + Send>;
+pub(crate) trait InternalServerServiceFactory: Send {
+    fn clone_factory(&self) -> Box<InternalServerServiceFactory>;
 
     fn create(&self) -> Box<Future<Item = BoxedServerService, Error = ()>>;
 }
 
-impl<F, T> ServerServiceFactory for ServerNewService<F, T>
+impl<F> InternalServerServiceFactory for ServerNewService<F>
 where
-    F: Fn() -> T + Send + Clone + 'static,
-    T: NewService<Request = TcpStream, Response = (), Error = (), InitError = ()> + 'static,
-    T::Service: 'static,
-    T::Future: 'static,
+    F: ServerServiceFactory,
 {
-    fn clone_factory(&self) -> Box<ServerServiceFactory + Send> {
+    fn clone_factory(&self) -> Box<InternalServerServiceFactory> {
         Box::new(Self {
             inner: self.inner.clone(),
         })
     }
 
     fn create(&self) -> Box<Future<Item = BoxedServerService, Error = ()>> {
-        Box::new((self.inner)().new_service().map(move |inner| {
+        Box::new(self.inner.create().new_service().map(move |inner| {
             let service: BoxedServerService = Box::new(ServerService::new(inner));
             service
         }))
     }
 }
 
-impl ServerServiceFactory for Box<ServerServiceFactory> {
-    fn clone_factory(&self) -> Box<ServerServiceFactory + Send> {
+impl InternalServerServiceFactory for Box<InternalServerServiceFactory> {
+    fn clone_factory(&self) -> Box<InternalServerServiceFactory> {
         self.as_ref().clone_factory()
     }
 
@@ -120,3 +111,21 @@ impl ServerServiceFactory for Box<ServerServiceFactory> {
         self.as_ref().create()
     }
 }
+
+pub trait ServerServiceFactory: Send + Clone + 'static {
+    type NewService: NewService<Request = TcpStream, Response = (), Error = (), InitError = ()>;
+
+    fn create(&self) -> Self::NewService;
+}
+
+impl<F, T> ServerServiceFactory for F
+where
+    F: Fn() -> T + Send + Clone + 'static,
+    T: NewService<Request = TcpStream, Response = (), Error = (), InitError = ()>,
+{
+    type NewService = T;
+
+    fn create(&self) -> T {
+        (self)()
+    }
+}
diff --git a/src/worker.rs b/src/worker.rs
index 8d4bcac0..10354a26 100644
--- a/src/worker.rs
+++ b/src/worker.rs
@@ -17,7 +17,7 @@ use actix::{
 };
 
 use super::accept::AcceptNotify;
-use super::server_service::{BoxedServerService, ServerMessage, ServerServiceFactory};
+use super::server_service::{BoxedServerService, InternalServerServiceFactory, ServerMessage};
 use super::Token;
 
 #[derive(Message)]
@@ -122,7 +122,7 @@ impl Actor for Worker {
 
 impl Worker {
     pub(crate) fn new(
-        ctx: &mut Context<Self>, services: Vec<Box<ServerServiceFactory + Send>>,
+        ctx: &mut Context<Self>, services: Vec<Box<InternalServerServiceFactory>>,
         availability: WorkerAvailability,
     ) -> Self {
         let wrk = MAX_CONNS_COUNTER.with(|conns| Worker {