Hi Scott, according exception detail there is problem in remote host specification - mentioned address ::1 seems to be IPv6 type, but log4net probably supports only IPv4. If log4net can not be configured to use IPv6, you can try to uninstall IPv6 protocol pro your PC, if possible. Radovan
________________________________ From: Scott Glass [mailto:[EMAIL PROTECTED] Sent: Friday, August 03, 2007 6:21 PM To: log4net-user@logging.apache.org Subject: UDP Appender Issues Hello, I'm trying to log events to ChainSaw using the UdpAppender. However, even after following the directions on the web site I keep getting the message: log4net:ERROR [UdpAppender] Unable to send logging event to remote host ::1 on port 8080. System.Net.Sockets.SocketException: An address incompatible with the requested protocol was used at System.Net.Sockets.Socket.SendTo(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, EndPoint remoteEP) at System.Net.Sockets.UdpClient.Send(Byte[] dgram, Int32 bytes, IPEndPoint endPoint) at log4net.Appender.UdpAppender.Append(LoggingEvent loggingEvent) A first chance exception of type 'System.NullReferenceException' occurred in com.sungard.servicemanagement.AuthListService_200708.InfoModel.DLL The thread 0x918 has exited with code 0 (0x0). <appender name="UdpAppender" type="log4net.Appender.UdpAppender"> <remoteAddress value="127.0.0.1" /> <remotePort value="8080" /> <layout type="log4net.Layout.XmlLayoutSchemaLog4j"> <locationInfo value="true" /> </layout> </appender> Firewall rules are in place to allow UDP:8080 traffic and netStat shows an open listener on port 8080. I'm at a loss, any ideas? Thanks, Scott