diff --git a/library/server/httpd/configuration/httpd_configuration_i.e b/library/server/httpd/configuration/httpd_configuration_i.e
index 1e491775..e29c7a8d 100644
--- a/library/server/httpd/configuration/httpd_configuration_i.e
+++ b/library/server/httpd/configuration/httpd_configuration_i.e
@@ -53,8 +53,10 @@ feature -- Access
 			-- Max number of concurrent connections.
 
 	force_single_threaded: BOOLEAN assign set_force_single_threaded
+		obsolete
+			"Use directly `max_concurrent_connections = 1` [Feb/2017]"
 		do
-			Result := max_concurrent_connections = 0
+			Result := max_concurrent_connections <= 1
 		end
 
 	is_verbose: BOOLEAN assign set_is_verbose
@@ -198,16 +200,18 @@ feature -- Element change
 
 	set_force_single_threaded (v: like force_single_threaded)
 			-- Force server to handle incoming request in a single thread.
-			-- i.e set max_concurrent_connections to 0!
+			-- i.e set max_concurrent_connections to 1!
 		obsolete
-			"Use set_max_concurrent_connections (0) [June/2016]"
+			"Use set_max_concurrent_connections (1) [June/2016]"
 		do
 			if v then
-				set_max_concurrent_connections (0)
+				set_max_concurrent_connections (1)
+			else
+				set_max_concurrent_connections (default_max_concurrent_connections)
 			end
-			--|Missing postcondition
-			--| force_single_thread_set: v implies max_concurrent_connections = 0	
-			--| not_single_thread: not v implies max_concurrent_connections > 0	
+		ensure
+			force_single_threaded_set: v implies max_concurrent_connections <= 1	
+			not_single_threaded: not v implies max_concurrent_connections > 1	
 		end
 
 	set_is_verbose (b: BOOLEAN)
diff --git a/library/server/wsf/connector/standalone/wsf_standalone_service_launcher.e b/library/server/wsf/connector/standalone/wsf_standalone_service_launcher.e
index 3240dd98..38b3fbf0 100644
--- a/library/server/wsf/connector/standalone/wsf_standalone_service_launcher.e
+++ b/library/server/wsf/connector/standalone/wsf_standalone_service_launcher.e
@@ -9,7 +9,7 @@ note
 				port: numeric such as 8099 (or equivalent string as "8099")
 				base: base_url (very specific to standalone server)
 				
-				max_concurrent_connections: set one, for single threaded behavior
+				max_concurrent_connections: set to 1, for single threaded behavior
 				max_tcp_clients: max number of open tcp connection
 				
 				socket_timeout: connection timeout
@@ -106,7 +106,8 @@ feature {NONE} -- Initialization
 				port_number := opts.option_integer_value ("port", port_number)
 
 				if opts.option_boolean_value ("force_single_threaded", False) then
-					force_single_threaded
+						-- Obsolete: keep for backward compatibility with obsolete Nino connector.
+					set_max_concurrent_connections (1)
 				end
 				max_concurrent_connections := opts.option_integer_value ("max_concurrent_connections", max_concurrent_connections)
 				max_tcp_clients := opts.option_integer_value ("max_tcp_clients", max_tcp_clients)
@@ -139,10 +140,24 @@ feature {NONE} -- Initialization
 
 	force_single_threaded
 			-- Set `single_threaded' to True.
+		obsolete
+			"Use set_max_concurrent_connections (1) [Feb/2017]"
 		do
-			max_concurrent_connections := 1
+			set_max_concurrent_connections (1)
+		ensure
+			single_threaded: single_threaded
  		end
 
+	set_max_concurrent_connections (v: like max_concurrent_connections)
+			-- Set `max_concurrent_connections` to `v`.
+		require
+			v_positive_or_zero: v >= 0
+		do
+			max_concurrent_connections := v
+		ensure
+			max_concurrent_connections_set : max_concurrent_connections = v
+		end
+
 feature -- Execution
 
 	update_configuration (cfg: like connector.configuration)
@@ -162,7 +177,7 @@ feature -- Execution
 
 	launch
 			-- <Precursor/>
-			-- using `port_number', `base_url', `verbose' and `single_threaded'
+			-- using associated settings/configuration.
 		local
 			conn: like connector
 		do
@@ -219,11 +234,13 @@ feature {NONE} -- Implementation
 			-- Help defining the verbosity.
 			-- The higher, the more output.
 
-	max_concurrent_connections: INTEGER
+	max_concurrent_connections: INTEGER assign set_max_concurrent_connections
 
 	single_threaded: BOOLEAN
+		obsolete
+			"Use max_concurrent_connections <= 1 [Feb/2017]"
 		do
-			Result := max_concurrent_connections = 0
+			Result := max_concurrent_connections <= 1
 		end
 
 	max_tcp_clients: INTEGER