mod-mono-server 4は動作しませんが、2は動作します。

Centos 6サーバーにASP.NET MVC4（最小MVC3）アプリケーションをデプロイする必要があります。

Mono 3.2.1、XSP4、mod_mono（Apache Webサーバーで使用）をインストールし、Monoで使用するテストアプリケーションを正常に実行しました。構成ツールを使用してアプリケーションカタログの構成を作成し、.Net 2.0のVS2012で生成された空のASP.NET WebPagesプロジェクトをデプロイしました。正常に動作しました。ただし、.net 4.5または4.0以上のアプリケーションを実行する必要があるため、構成でMonoServerPathをmod-mono-server2の代わりにmod-mono-server4に設定しましたが、これを試みると「サービスを一時的に使用できません」というメッセージが表示されます。 asp .netプロジェクトディレクトリにアクセスします（空の場合でも）。

何を確認する必要がありますか？

修正する:Apacheログを確認しましたが、次のように表示されます。

mod-mono-server4
Exception caught during reading the configuration file:
System.MissingMethodException: Method not found: 'System.Configuration.IConfigurationSectionHandler.Create'.
  at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.get_AppSettings () [0x00000] in <filename unknown>:0 
  at Mono.WebServer.Apache.Server.get_AppSettings () [0x00001] in /usr/src/xsp-2.10.2/src/Mono.WebServer.Apache/main.cs:208 
  at Mono.WebServer.Apache.Server+ApplicationSettings..ctor () [0x0002a] in /usr/src/xsp-2.10.2/src/Mono.WebServer.Apache/main.cs:63 
mod-mono-server4
Listening on: /tmp/mod_mono_server_Unreal
Root directory: /var/www/html/Unreal
Error: An exception was thrown by the type initializer for System.Net.Sockets.Socket
mod-mono-server4
Exception caught during reading the configuration file:
System.MissingMethodException: Method not found: 'System.Configuration.IConfigurationSectionHandler.Create'.
  at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.get_AppSettings () [0x00000] in <filename unknown>:0 
  at Mono.WebServer.Apache.Server.get_AppSettings () [0x00001] in /usr/src/xsp-2.10.2/src/Mono.WebServer.Apache/main.cs:208 
  at Mono.WebServer.Apache.Server+ApplicationSettings..ctor () [0x0002a] in /usr/src/xsp-2.10.2/src/Mono.WebServer.Apache/main.cs:63 
mod-mono-server4
Listening on: /tmp/mod_mono_server_Unreal
Root directory: /var/www/html/Unreal
Error: An exception was thrown by the type initializer for System.Net.Sockets.Socket
mod-mono-server4
Exception caught during reading the configuration file:
System.MissingMethodException: Method not found: 'System.Configuration.IConfigurationSectionHandler.Create'.
  at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.get_AppSettings () [0x00000] in <filename unknown>:0 
  at Mono.WebServer.Apache.Server.get_AppSettings () [0x00001] in /usr/src/xsp-2.10.2/src/Mono.WebServer.Apache/main.cs:208 
  at Mono.WebServer.Apache.Server+ApplicationSettings..ctor () [0x0002a] in /usr/src/xsp-2.10.2/src/Mono.WebServer.Apache/main.cs:63 
mod-mono-server4
Listening on: /tmp/mod_mono_server_Unreal
Root directory: /var/www/html/Unreal
Error: An exception was thrown by the type initializer for System.Net.Sockets.Socket
[Wed Sep 25 08:45:13 2013] [error] Failed to connect to mod-mono-server after several attempts to spawn the process.