Hi, working with wildfly 10.1 SNAPSHOT, with latest update as of Mar/23 The issue is, add an error-page filter, named error3, remove it, add with the same name, it throws an exception of duplicated name, see below. The remove operation, requires a reload, but does it should prevent the adding of a item with the same name ? I thought the reload operation is necessary only to apply the settings at boot time. [standalone@localhost:9990 /] /subsystem=undertow/configuration=filter/error-page=error3:add(code=402,path="caminho2.html") {"outcome" => "success"} [standalone@localhost:9990 /] /subsystem=undertow/configuration=filter/error-page=error3:remove { "outcome" => "success", "response-headers" => { "operation-requires-reload" => true, "process-state" => "reload-required" } } [standalone@localhost:9990 /] /subsystem=undertow/configuration=filter/error-page=error3:add(code=402,path="caminho2.html") { "outcome" => "failed", "failure-description" => "WFLYCTL0158: Operation handler failed: org.jboss.msc.service.DuplicateServiceException: Service jboss.undertow.filter.error3 is already registered", "rolled-back" => true, "response-headers" => {"process-state" => "reload-required"} } -- Claudio Miranda claudio(a)claudius.com.br http://www.claudius.com.br