https://mydomain/alfresco/webdav

HTTP Status 500 - 09200022 Failed to set current user (null)
type Exception report
message 09200022 Failed to set current user (null)
description The server encountered an internal error that prevented it from fulfilling this request.
exception

org.alfresco.repo.security.authentication.AuthenticationException: 09200022 Failed to set current user (null)
org.alfresco.repo.security.authentication.AbstractChainingAuthenticationComponent.setCurrentUser(AbstractChainingAuthenticationComponent.java:195)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
	org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
	org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
	org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
	org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	com.sun.proxy.$Proxy123.setCurrentUser(Unknown Source)
	org.alfresco.repo.webdav.auth.BaseAuthenticationFilter.getSessionUser(BaseAuthenticationFilter.java:260)
	org.alfresco.repo.webdav.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:121)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.alfresco.repo.management.subsystems.ChainingSubsystemProxyFactory$1.invoke(ChainingSubsystemProxyFactory.java:132)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	com.sun.proxy.$Proxy230.doFilter(Unknown Source)
	org.alfresco.repo.web.filter.beans.BeanProxyFilter.doFilter(BeanProxyFilter.java:89)
	org.alfresco.web.app.servlet.GlobalLocalizationFilter.doFilter(GlobalLocalizationFilter.java:68)

root cause

org.alfresco.repo.security.authentication.AuthenticationException: 09200021 User "(null)" does not exist in Alfresco
	org.alfresco.repo.security.authentication.AbstractAuthenticationComponent$FixCurrentUserCallback$1.doWork(AbstractAuthenticationComponent.java:556)
	org.alfresco.repo.security.authentication.AbstractAuthenticationComponent$FixCurrentUserCallback$1.doWork(AbstractAuthenticationComponent.java:1)
	org.alfresco.repo.tenant.TenantUtil.runAsWork(TenantUtil.java:126)
	org.alfresco.repo.tenant.TenantUtil.runAsTenant(TenantUtil.java:95)
	org.alfresco.repo.tenant.TenantUtil$1.doWork(TenantUtil.java:69)
	org.alfresco.repo.security.authentication.AuthenticationUtil.runAs(AuthenticationUtil.java:555)
	org.alfresco.repo.tenant.TenantUtil.runAsUserTenant(TenantUtil.java:65)
	org.alfresco.repo.tenant.TenantUtil.runAsSystemTenant(TenantUtil.java:119)
	org.alfresco.repo.security.authentication.AbstractAuthenticationComponent$FixCurrentUserCallback.execute(AbstractAuthenticationComponent.java:539)
	org.alfresco.repo.security.authentication.AbstractAuthenticationComponent$FixCurrentUserCallback.execute(AbstractAuthenticationComponent.java:1)
	org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:464)
	org.alfresco.repo.security.authentication.AbstractAuthenticationComponent.setCurrentUser(AbstractAuthenticationComponent.java:234)
	org.alfresco.repo.security.authentication.AbstractAuthenticationComponent.setCurrentUser(AbstractAuthenticationComponent.java:203)
	org.alfresco.repo.security.authentication.AbstractChainingAuthenticationComponent.setCurrentUser(AbstractChainingAuthenticationComponent.java:188)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
	org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
	org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
	org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
	org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	com.sun.proxy.$Proxy123.setCurrentUser(Unknown Source)
	org.alfresco.repo.webdav.auth.BaseAuthenticationFilter.getSessionUser(BaseAuthenticationFilter.java:260)
	org.alfresco.repo.webdav.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:121)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.alfresco.repo.management.subsystems.ChainingSubsystemProxyFactory$1.invoke(ChainingSubsystemProxyFactory.java:132)
	org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	com.sun.proxy.$Proxy230.doFilter(Unknown Source)
	org.alfresco.repo.web.filter.beans.BeanProxyFilter.doFilter(BeanProxyFilter.java:89)
	org.alfresco.web.app.servlet.GlobalLocalizationFilter.doFilter(GlobalLocalizationFilter.java:68)