--- a/libirccd/irccd/transport_client.cpp	Sun Nov 19 09:16:05 2017 +0100
+++ b/libirccd/irccd/transport_client.cpp	Mon Nov 20 19:16:43 2017 +0100
@@ -88,11 +88,11 @@
             auto json = nlohmann::json::parse(message);
 
             if (!json.is_object())
-                handler(nullptr, transport_error::invalid_message);
+                handler(nullptr, network_error::invalid_message);
             else
                 handler(json, code);
         } catch (...) {
-            handler(nullptr, transport_error::invalid_message);
+            handler(nullptr, network_error::invalid_message);
         }
     });
 }
@@ -126,44 +126,4 @@
     set_state(state_t::closing);
 }
 
-/*
- * transport_category
- * ------------------------------------------------------------------
- */
-const boost::system::error_category& transport_category() noexcept
-{
-    static const class category : public boost::system::error_category {
-    public:
-        const char* name() const noexcept override
-        {
-            return "transport";
-        }
-
-        std::string message(int e) const override
-        {
-            switch (static_cast<transport_error>(e)) {
-            case transport_error::invalid_auth:
-                return "invalid authentication";
-            case transport_error::invalid_message:
-                return "invalid message";
-            case transport_error::incomplete_message:
-                return "incomplete message";
-            }
-
-            return "unknown error";
-        }
-    } cat;
-
-    return cat;
-}
-
-/*
- * make_error_code
- * ------------------------------------------------------------------
- */
-boost::system::error_code make_error_code(transport_error e) noexcept
-{
-    return {static_cast<int>(e), transport_category()};
-}
-
 } // !irccd

--- a/libirccd/irccd/transport_client.hpp	Sun Nov 19 09:16:05 2017 +0100
+++ b/libirccd/irccd/transport_client.hpp	Mon Nov 20 19:16:43 2017 +0100
@@ -37,15 +37,6 @@
 class transport_server;
 
 /**
- * \brief Error for transports.
- */
-enum class transport_error : int {
-    invalid_auth = 1,       //! invalid authentication
-    invalid_message,        //! client has sent an invalid message
-    incomplete_message      //!< message requires more parameter
-};
-
-/**
  * \brief Abstract transport client class.
  *
  * This class is responsible of receiving/sending data.
@@ -363,33 +354,6 @@
     }
 };
 
-/**
- * Get the transport category.
- *
- * \return the singleton category
- */
-const boost::system::error_category& transport_category() noexcept;
-
-/**
- * Wrap the creation of an error_code based on transport_server::error.
- *
- * \param e the transport_server error code
- * \return a boost::system::error_code with transport_category
- */
-boost::system::error_code make_error_code(transport_error e) noexcept;
-
 } // !irccd
 
-namespace boost {
-
-namespace system {
-
-template <>
-struct is_error_code_enum<irccd::transport_error> : public std::true_type {
-};
-
-} // !system
-
-} // !boost
-
 #endif // !IRCCD_TRANSPORT_CLIENT_HPP

--- a/libirccd/irccd/transport_server.cpp	Sun Nov 19 09:16:05 2017 +0100
+++ b/libirccd/irccd/transport_server.cpp	Mon Nov 20 19:16:43 2017 +0100
@@ -36,12 +36,12 @@
     auto password = message["password"];
 
     if (!command.is_string() || !password.is_string()) {
-        handler(nullptr, transport_error::incomplete_message);
+        handler(nullptr, network_error::invalid_message);
         return false;
     }
 
     if (command != "auth" || password.get<std::string>() != password_) {
-        handler(nullptr, transport_error::invalid_auth);
+        handler(nullptr, network_error::invalid_auth);
         return false;
     }