diff --git a/devops-service/app/api2/routes/v2.0.rb b/devops-service/app/api2/routes/v2.0.rb
index 53310b3..aa41bb5 100644
--- a/devops-service/app/api2/routes/v2.0.rb
+++ b/devops-service/app/api2/routes/v2.0.rb
@@ -10,6 +10,7 @@ require "exceptions/dependency_error"
 require "exceptions/conflict_exception"
 require "exceptions/parser_error"
 require "exceptions/validation_error"
+require "exceptions/knife_config_error"
 require 'core/devops-logger'
 
 require_relative "../helpers/version_2"
@@ -58,8 +59,12 @@ module Devops
       # set current logger and call handlers
       def call env
         DevopsLogger.logger = @@logger
-        res = super(env)
-        @@access_logger.info(env["REQUEST_METHOD"] + " " + env["REQUEST_URI"] + " - from #{env["HTTP_USER_AGENT"]}")
+        begin
+          res = super(env)
+        rescue DevopsError => e
+          return [e.code, {}, e.message]
+        end
+        @@access_logger.info(env["REQUEST_METHOD"] + " " + env["REQUEST_URI"] + " - from #{env["HTTP_USER_AGENT"]} (#{env["REMOTE_USER"]}) / #{res.inspect}")
         res
       end
 
@@ -75,6 +80,12 @@ module Devops
         halt_response(e.message, 400)
       end
 
+      error Devops::Exception::KnifeConfigError do
+        e = env["sinatra.error"]
+        logger.error e.message
+        halt_response(e.message, 500)
+      end
+
       error RecordNotFound do
         e = env["sinatra.error"]
         logger.warn e.message
diff --git a/devops-service/exceptions/knife_config_error.rb b/devops-service/exceptions/knife_config_error.rb
new file mode 100644
index 0000000..fd77a8f
--- /dev/null
+++ b/devops-service/exceptions/knife_config_error.rb
@@ -0,0 +1,9 @@
+require 'exceptions/devops_error'
+module Devops
+  module Exception
+    class KnifeConfigError < DevopsError
+
+    end
+  end
+end
+
diff --git a/devops-service/exceptions/response_error.rb b/devops-service/exceptions/response_error.rb
new file mode 100644
index 0000000..996ec04
--- /dev/null
+++ b/devops-service/exceptions/response_error.rb
@@ -0,0 +1,13 @@
+module Devops
+  module Exception
+
+    class DevopsError < StandardError
+
+      def code
+        500
+      end
+
+    end
+
+  end
+end