diff --git a/src/lib_p2p/p2p.ml b/src/lib_p2p/p2p.ml
index 4669ef5dd..5b564922a 100644
--- a/src/lib_p2p/p2p.ml
+++ b/src/lib_p2p/p2p.ml
@@ -543,9 +543,6 @@ let build_rpc_directory net =
       match net.pool with
       | None -> failwith "The P2P layer is disabled."
       | Some pool ->
-          fail_when
-            (P2p_pool.Points.banned pool point)
-            (P2p_errors.Point_banned point) >>=? fun () ->
           P2p_pool.connect ~timeout pool point >>=? fun _conn ->
           return ()
     end in
@@ -674,9 +671,10 @@ let build_rpc_directory net =
       begin fun peer_id () () ->
         match net.pool with
         | None -> return false
+        | Some pool when (P2p_pool.Peers.get_trusted pool peer_id) ->
+            return false
         | Some pool ->
-            if P2p_pool.Peers.get_trusted pool peer_id then return false
-            else return (P2p_pool.Peers.banned pool peer_id)
+            return (P2p_pool.Peers.banned pool peer_id)
       end in
 
   (* Network : Point *)
@@ -766,12 +764,11 @@ let build_rpc_directory net =
     RPC_directory.gen_register1 dir P2p_services.Points.S.banned
       begin fun point () () ->
         match net.pool with
-        | None -> RPC_answer.return false
+        | None -> RPC_answer.not_found
+        | Some pool when (P2p_pool.Points.get_trusted pool point) ->
+            RPC_answer.return false
         | Some pool ->
-            if P2p_pool.Points.get_trusted pool point then
-              RPC_answer.return false
-            else
-              RPC_answer.return (P2p_pool.Points.banned pool point)
+            RPC_answer.return (P2p_pool.Points.banned pool point)
       end in
 
   (* Network : Greylist *)
diff --git a/src/lib_p2p/p2p_acl.ml b/src/lib_p2p/p2p_acl.ml
index 3d551f55e..9444da75e 100644
--- a/src/lib_p2p/p2p_acl.ml
+++ b/src/lib_p2p/p2p_acl.ml
@@ -1,6 +1,6 @@
 (**************************************************************************)
 (*                                                                        *)
-(*    Copyright (c) 2014 - 2016.                                          *)
+(*    Copyright (c) 2014 - 2018.                                          *)
 (*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
 (*                                                                        *)
 (*    All rights reserved. No warranty, explicit or implicit, provided.   *)
@@ -112,7 +112,7 @@ module IpSet = struct
       type result = Time.t
       let default = Time.now()
       let map _t _key value = value
-      let reduce _t left right = Time.(max left right)
+      let reduce _t left right = Time.(min left right)
     end
     in
     let module MR = M.Map_Reduce(MI) in
diff --git a/src/lib_p2p/p2p_acl.mli b/src/lib_p2p/p2p_acl.mli
index 3a9f5e02b..e2add6c6b 100644
--- a/src/lib_p2p/p2p_acl.mli
+++ b/src/lib_p2p/p2p_acl.mli
@@ -9,10 +9,12 @@
 
 (**
    This module implements four Access Control Lists:
-   - ip greylist used to automatically ban a given ip address.
-   - peer_id greylist used to automatically ban a given peer_id.
-   - ip blacklist used to manually ban a given ip addr.
-   - peers blacklist used to manually trust a given peer_id.
+   - ip greylist is a set of banned ip addresses automatically added by
+     the p2p layer.
+   - peer_id greylist is a set of banned peers ids automatically added by
+     the p2p layer.
+   - ip blacklist is a set of ip addresses manually added by the node admin.
+   - peers blacklist is a set of peers ids manually added by the node admin.
 
    IP greylists use a time based GC to periodically remove entries from
    the table, while peer_id grey lists are built using a ring structure,
diff --git a/src/lib_shell_services/p2p_services.mli b/src/lib_shell_services/p2p_services.mli
index 3f826e8a4..1d938bd25 100644
--- a/src/lib_shell_services/p2p_services.mli
+++ b/src/lib_shell_services/p2p_services.mli
@@ -132,12 +132,10 @@ module Points : sig
        unit * P2p_point.Id.t, unit, unit,
        bool) RPC_service.t
 
-
   end
 
 end
 
-
 module Peers : sig
 
   val list: