log4net Udp appender in mono on Ubuntu not logging

Question

Running Ubuntu on a Minnow Max trying to use log4net in a mono application the Udp appender does not log to the remote location. Running the same application on a Raspberry Pi 2 with identical configs the Udp appender logs correctly. When I enable log4net logging there are no errors and the output of the log was identical on both machines. I have used nmap and Wire Shark to verify the Udp port is open and sending packets. The file appender on the Minnow is logging correctly.

C# Code

private static readonly ILog Logger = LogManager.GetLogger($"Drake.Mfg.DCS.{Environment.MachineName}");
public static LogLevel ConsoleLevel { get; set; }

public static void LogToNet(string message, LogLevel logLevel)
{
    try
    {
        switch (logLevel)
        {
            case LogLevel.None:
                break;
            case LogLevel.Trace:
                Logger.Trace(message);
                break;
            case LogLevel.Debug:
                Logger.Debug(message);
                break;
            case LogLevel.Info:
                Logger.Info(message);
                break;
            case LogLevel.Warn:
                Logger.Warn(message);
                break;
            case LogLevel.Error:
                Logger.Error(message);
                break;
            case LogLevel.Fatal:
                Logger.Fatal(message);
                break;
            case LogLevel.AlwaysLog:
                Logger.Info(message);
                break;
            default:
                throw new ArgumentOutOfRangeException(nameof(consoleLevel), consoleLevel, null);
        }
        Console.WriteLine($"{message}");
        Console.ResetColor();
    }

Log4Net.Config

<?xml version="1.0" encoding="utf-8"?>
<log4net>
  <appender name="Main" type="log4net.Appender.RollingFileAppender">
    <file value="dcsLog.log" />
    <appendToFile value="true" />
    <maximumFileSize value="1GB" />
    <maxSizeRollBackups value="3" />
    <encoding value="utf-8" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%utcdate{ISO8601} %-8level %-28logger %message%newline" />
    </layout>
</appender>
  <appender name="UdpAppender" type="log4net.Appender.UdpAppender">
    <remoteAddress value="192.168.10.53" />
    <remotePort value="7071" />
    <layout type="log4net.Layout.XmlLayoutSchemaLog4j" />
    <encoding value="utf-8" />
  </appender>
  <root>
    <level value="Debug" />
    <appender-ref ref="Main" />
  </root>
  <logger name="Drake.Mfg.DCS.DEI80021">
    <level value="Debug" />
    <appender-ref ref="UdpAppender" />
  </logger>
</log4net>

Mono

Mono JIT compiler version 4.3.0 (master/844fc33 Tue Oct 20 14:21:50 EDT 2015) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: amd64 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: sgen

log4net

1.2.15

Answer 1

The Log4Net config is case sensitive as xml is. The Hostname for the Minnow was in lowercase and I was looking for upper. Because I do not have sole control over hostnames I used a To Upper.

ILog logger = LogManager.GetLogger($"Drake.Mfg.DCS.{Environment.MachineName.ToUpper()}");

Fixed it now and in the future.