Inbound Web Service Call Fails with HTTP-400 and Warning in Instance Node Log: Security restricted: Invalid x-forwarded-host header - Support and Troubleshooting

Inbound Web Service Call Fails with HTTP-400 and Warning in Instance Node Log: Security restricted: Invalid x-forwarded-host header Issue An inbound web service call fails and returns an HTTP-400 response to the client.

Checking the instance node logs at the time of the call shows an error like this:

020-03-25 08:22:29 (789) http-1 SYSTEM WARNING *** WARNING *** Security restricted: Invalid x-forwarded-host header: /10.10.10.10:5654 2020-03-25 08:22:29 (790) http-1 SYSTEM WARNING *** WARNING *** No active connections for the session/thread 2020-03-25 08:22:29 (790) http-1 SYSTEM SEVERE *** ERROR *** Uncaught exception in GlideTransactionProcessor.doRequest(): java.lang.IllegalArgumentException: Invalid x-forwarded-host header: /10.10.10.10:5654 at com.glide.sys.TransactionRequestInfo. (TransactionRequestInfo.java:73) at com.glide.sys.Transaction.setContext(Transaction.java:420) at com.glide.ui.HTTPTransaction.setContext(HTTPTransaction.java:42) at com.glide.sys.Transaction. (Transaction.java:329) at com.glide.ui.HTTPTransaction. (HTTPTransaction.java:19) at com.glide.sys.Transaction.create(Transaction.java:2571) at com.glide.ui.GlideTransactionProcessor.doAsyncGlideServletTransaction(GlideTransactionProcessor.java:174) at com.glide.ui.GlideTransactionProcessor.doRequest(GlideTransactionProcessor.java:109) at com.glide.ui.GlideServlet.doRequest(GlideServlet.java:301) at com.glide.ui.GlideServlet.doGet(GlideServlet.java:264) at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) at com.glide.ui.GlideServlet.service(GlideServlet.java:256) at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806) at org.apache.tomcat.util.net.Nio2Endpoint$SocketProcessor.doRun(Nio2Endpoint.java:1682) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748)

Release Applies to any release.

Cause The web service client making the inbound call has set the x-forwarded-host header with an invalid value, in this example:

x-forwarded-host header: /10.10.10.10:5654

The inclusion of the "/" makes the header invalid.

There can be many variations of an invalid header settings, this is just one example.

Resolution The calling client must change the x-forwarded-host header sent to be a valid header, for the example used this would be a valid header:

x-forwarded-host header: 10.10.10.10:5654

Simply by removing the "/" the header is now valid.

For valid formats of this header refer to these sites:

https://en.wikipedia.org/wiki/List_of_HTTP_header_fields X-Forwarded-Host: en.wikipedia.org:8080 X-Forwarded-Host: en.wikipedia.org

And

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host X-Forwarded-Host: id42.example-cdn.com