diff --git a/actix-server/CHANGES.md b/actix-server/CHANGES.md
index 32a62691..0183271d 100644
--- a/actix-server/CHANGES.md
+++ b/actix-server/CHANGES.md
@@ -6,6 +6,8 @@
 
 * Add `ServerBuilder::maxconnrate` sets the maximum per-worker number of concurrent connections
 
+* Add helper ssl error `SslError`
+
 
 ### Changed
 
diff --git a/actix-server/src/builder.rs b/actix-server/src/builder.rs
index b23a174c..bafaa6b7 100644
--- a/actix-server/src/builder.rs
+++ b/actix-server/src/builder.rs
@@ -87,7 +87,7 @@ impl ServerBuilder {
     /// can be used to limit the global SSL CPU usage.
     ///
     /// By default max connections is set to a 256.
-    pub fn maxconnrate(mut self, num: usize) -> Self {
+    pub fn maxconnrate(self, num: usize) -> Self {
         ssl::max_concurrent_ssl_connect(num);
         self
     }
diff --git a/actix-server/src/ssl/mod.rs b/actix-server/src/ssl/mod.rs
index f91e2377..136da81f 100644
--- a/actix-server/src/ssl/mod.rs
+++ b/actix-server/src/ssl/mod.rs
@@ -33,3 +33,9 @@ pub(crate) static MAX_CONN: AtomicUsize = AtomicUsize::new(256);
 thread_local! {
     static MAX_CONN_COUNTER: Counter = Counter::new(MAX_CONN.load(Ordering::Relaxed));
 }
+
+/// Ssl error combinded with service error.
+pub enum SslError<E1, E2> {
+    Ssl(E1),
+    Service(E2),
+}