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https://issues.apache.org/jira/browse/LOG4NET-604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ralph Goers updated LOG4NET-604:
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LOG4NET is now dormant.
> UdpAppender does not resolve environment variables .Net Core
> ------------------------------------------------------------
>
> Key: LOG4NET-604
> URL: https://issues.apache.org/jira/browse/LOG4NET-604
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.0.8
> Environment: Asp.Net Core 2.1. Windows 7, MacOs 10.12.6
> Reporter: Sean E. Covel
> Priority: Major
>
> I have a UdpAppender defined in a .Net Framework 4.5.2 and a .Net Standard
> (Asp.Net Core 2.1) project.
>
> <appender name="UdpAppender" type="log4net.Appender.UdpAppender">
> <remoteAddress value="${LOGSERVER_HOST}" />
> <remotePort value="${LOGSERVER_PORT}" />
> <layout type="log4net.Layout.PatternLayout, log4net">
> <conversionPattern value="%d\{yyyy-MM-dd'T'HH:mm:ss.fff'Z'} %-5p
> [%property\{server_name} %property\{service_name} %property\{service_port}
> %property\{CorrelationId}][%t] %c\{5}:%L - %m%n"/>
> </layout>
> </appender>
> On .Net 4.5.2 the environment variable LOGSERVER_HOST and LOGSERVER_PORT are
> read and used by the appender.
> In .Net Standard I get the following error:
> log4net: Loading Appender [UdpAppender] type: [log4net.Appender.UdpAppender]
> log4net:ERROR Could not create Appender [UdpAppender] of type
> [log4net.Appender.UdpAppender]. Reported error follows.
> log4net.Util.TypeConverters.ConversionNotSupportedException: Cannot convert
> from type [System.String] value [${LOGSERVER_HOST}] to type
> [System.Net.IPAddress] ---> System.Net.Sockets.SocketException: No such host
> is known
> at System.Net.Dns.InternalGetHostByName(String hostName)
> at System.Net.Dns.ResolveCallback(Object context)
> --- End of stack trace from previous location where exception was thrown ---
> at System.Net.Dns.HostResolutionEndHelper(IAsyncResult asyncResult)
> at System.Net.Dns.EndGetHostEntry(IAsyncResult asyncResult)
> at System.Net.Dns.<>c.<GetHostEntryAsync>b__27_1(IAsyncResult asyncResult)
> at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar,
> Func`2 endFunction, Action`1 endAction, Task`1 promise, Bool
> ean requiresSynchronization)
> --- End of stack trace from previous location where exception was thrown ---
> at log4net.Util.TypeConverters.IPAddressConverter.ConvertFrom(Object source)
> --- End of inner exception stack trace ---
> at log4net.Util.TypeConverters.IPAddressConverter.ConvertFrom(Object source)
> at
> log4net.Repository.Hierarchy.XmlHierarchyConfigurator.SetParameter(XmlElement
> element, Object target)
> at
> log4net.Repository.Hierarchy.XmlHierarchyConfigurator.ParseAppender(XmlElement
> appenderElement)
> log4net:ERROR Appender named [UdpAppender] not found.
>
> I have run the project on Windows 7 and MacOs 10.12.6. The only way to get
> the UdpAppender to work on .Net Core is to hard-code the address and port in
> the xml configuration.
>
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