diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/io/DefaultHttpClientConnectionOperator.java b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/io/DefaultHttpClientConnectionOperator.java
index e2189d64d..64f0a6483 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/io/DefaultHttpClientConnectionOperator.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/io/DefaultHttpClientConnectionOperator.java
@@ -53,7 +53,6 @@ import org.apache.hc.core5.annotation.Internal;
 import org.apache.hc.core5.annotation.ThreadingBehavior;
 import org.apache.hc.core5.http.ConnectionClosedException;
 import org.apache.hc.core5.http.HttpHost;
-import org.apache.hc.core5.http.URIScheme;
 import org.apache.hc.core5.http.config.Lookup;
 import org.apache.hc.core5.http.io.SocketConfig;
 import org.apache.hc.core5.http.protocol.HttpContext;
@@ -226,7 +225,7 @@ public class DefaultHttpClientConnectionOperator implements HttpClientConnection
                             host.getHostName(), host.getPort(), localAddress, remoteAddress, ConnPoolSupport.getId(conn));
                 }
                 final TlsSocketStrategy tlsSocketStrategy = tlsSocketStrategyLookup != null ? tlsSocketStrategyLookup.lookup(host.getSchemeName()) : null;
-                if (tlsSocketStrategy != null && URIScheme.HTTPS.same(host.getSchemeName())) {
+                if (tlsSocketStrategy != null) {
                     final Socket upgradedSocket = tlsSocketStrategy.upgrade(socket, host.getHostName(), port, attachment, context);
                     conn.bind(upgradedSocket);
                 }
@@ -266,18 +265,18 @@ public class DefaultHttpClientConnectionOperator implements HttpClientConnection
             final HttpHost host,
             final Object attachment,
             final HttpContext context) throws IOException {
-        final TlsSocketStrategy tlsSocketStrategy = tlsSocketStrategyLookup != null ? tlsSocketStrategyLookup.lookup(host.getSchemeName()) : null;
-        if (tlsSocketStrategy == null) {
-            throw new UnsupportedSchemeException(host.getSchemeName() +
-                    " protocol is not supported");
-        }
         final Socket socket = conn.getSocket();
         if (socket == null) {
             throw new ConnectionClosedException("Connection is closed");
         }
-        final int port = this.schemePortResolver.resolve(host);
-        final SSLSocket upgradedSocket = tlsSocketStrategy.upgrade(socket, host.getHostName(), port, attachment, context);
-        conn.bind(upgradedSocket);
+        final TlsSocketStrategy tlsSocketStrategy = tlsSocketStrategyLookup != null ? tlsSocketStrategyLookup.lookup(host.getSchemeName()) : null;
+        if (tlsSocketStrategy != null) {
+            final int port = this.schemePortResolver.resolve(host);
+            final SSLSocket upgradedSocket = tlsSocketStrategy.upgrade(socket, host.getHostName(), port, attachment, context);
+            conn.bind(upgradedSocket);
+        } else {
+            throw new UnsupportedSchemeException(host.getSchemeName() + " protocol is not supported");
+        }
     }
 
 }
diff --git a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/DefaultAsyncClientConnectionOperator.java b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/DefaultAsyncClientConnectionOperator.java
index 9571af4e2..0a046887d 100644
--- a/httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/DefaultAsyncClientConnectionOperator.java
+++ b/httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/DefaultAsyncClientConnectionOperator.java
@@ -34,6 +34,7 @@ import java.util.concurrent.Future;
 
 import org.apache.hc.client5.http.DnsResolver;
 import org.apache.hc.client5.http.SchemePortResolver;
+import org.apache.hc.client5.http.UnsupportedSchemeException;
 import org.apache.hc.client5.http.config.TlsConfig;
 import org.apache.hc.client5.http.impl.DefaultSchemePortResolver;
 import org.apache.hc.client5.http.nio.AsyncClientConnectionOperator;
@@ -44,7 +45,6 @@ import org.apache.hc.core5.concurrent.ComplexFuture;
 import org.apache.hc.core5.concurrent.FutureCallback;
 import org.apache.hc.core5.concurrent.FutureContribution;
 import org.apache.hc.core5.http.HttpHost;
-import org.apache.hc.core5.http.URIScheme;
 import org.apache.hc.core5.http.config.Lookup;
 import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
 import org.apache.hc.core5.http.protocol.HttpContext;
@@ -109,7 +109,7 @@ final class DefaultAsyncClientConnectionOperator implements AsyncClientConnectio
                     public void completed(final IOSession session) {
                         final DefaultManagedAsyncClientConnection connection = new DefaultManagedAsyncClientConnection(session);
                         final TlsStrategy tlsStrategy = tlsStrategyLookup != null ? tlsStrategyLookup.lookup(host.getSchemeName()) : null;
-                        if (tlsStrategy != null && URIScheme.HTTPS.same(host.getSchemeName())) {
+                        if (tlsStrategy != null) {
                             try {
                                 final Timeout socketTimeout = connection.getSocketTimeout();
                                 final Timeout handshakeTimeout = tlsConfig.getHandshakeTimeout();
@@ -191,8 +191,9 @@ final class DefaultAsyncClientConnectionOperator implements AsyncClientConnectio
                         }
 
                     });
+        } else {
+            callback.failed(new UnsupportedSchemeException(host.getSchemeName() + " protocol is not supported"));
         }
-
     }
 
 }
diff --git a/httpclient5/src/test/java/org/apache/hc/client5/http/impl/io/TestHttpClientConnectionOperator.java b/httpclient5/src/test/java/org/apache/hc/client5/http/impl/io/TestHttpClientConnectionOperator.java
index fd5f1e600..28a40fa31 100644
--- a/httpclient5/src/test/java/org/apache/hc/client5/http/impl/io/TestHttpClientConnectionOperator.java
+++ b/httpclient5/src/test/java/org/apache/hc/client5/http/impl/io/TestHttpClientConnectionOperator.java
@@ -262,6 +262,9 @@ public class TestHttpClientConnectionOperator {
         final HttpContext context = new BasicHttpContext();
         final HttpHost host = new HttpHost("httpsssss", "somehost", -1);
 
+        Mockito.when(conn.isOpen()).thenReturn(true);
+        Mockito.when(conn.getSocket()).thenReturn(socket);
+
         Assertions.assertThrows(UnsupportedSchemeException.class, () ->
                 connectionOperator.upgrade(conn, host, context));
     }
@@ -271,6 +274,9 @@ public class TestHttpClientConnectionOperator {
         final HttpContext context = new BasicHttpContext();
         final HttpHost host = new HttpHost("http", "somehost", -1);
 
+        Mockito.when(conn.isOpen()).thenReturn(true);
+        Mockito.when(conn.getSocket()).thenReturn(socket);
+
         Assertions.assertThrows(UnsupportedSchemeException.class, () ->
                 connectionOperator.upgrade(conn, host, context));
     }