Service Temporarily Unavailable, cant connect to Tomcat

Question

Hello everybody,

I want to set up an IIS in front of my engine. I already executed the batch script as in the integration-guide described.

Now if I want to access the engine I get the following message:

"Service Temporarily Unavailable! The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. Tomcat/ISAPI/isapi_redirector/1.2.42"

I also took a look into the log-file of isapi_redirect_1.2.42 and got the following entries:

"[Tue May 29 13:22:42.100 2018] [1936:5868] [info] jk_open_socket::jk_connect.c (817): connect to 127.0.0.1:8009 failed (errno=61)

[Tue May 29 13:22:42.101 2018] [1936:5868] [info] ajp_connect_to_endpoint::jk_ajp_common.c (1068): (AxonIvyEngine) Failed opening socket to (127.0.0.1:8009) (errno=61)

[Tue May 29 13:22:42.101 2018] [1936:5868] [error] ajp_send_request::jk_ajp_common.c (1728): (AxonIvyEngine) connecting to backend failed. Tomcat is probably not started or is listening on the wrong port (errno=61)

[Tue May 29 13:22:42.101 2018] [1936:5868] [info] ajp_service::jk_ajp_common.c (2778): (AxonIvyEngine) sending request to tomcat failed (recoverable), because of error during request sending (attempt=1)

[Tue May 29 13:22:43.227 2018] [1936:5868] [info] jk_open_socket::jk_connect.c (817): connect to 127.0.0.1:8009 failed (errno=61)

[Tue May 29 13:22:43.227 2018] [1936:5868] [info] ajp_connect_to_endpoint::jk_ajp_common.c (1068): (AxonIvyEngine) Failed opening socket to (127.0.0.1:8009) (errno=61)

[Tue May 29 13:22:43.227 2018] [1936:5868] [error] ajp_send_request::jk_ajp_common.c (1728): (AxonIvyEngine) connecting to backend failed. Tomcat is probably not started or is listening on the wrong port (errno=61)

[Tue May 29 13:22:43.227 2018] [1936:5868] [info] ajp_service::jk_ajp_common.c (2778): (AxonIvyEngine) sending request to tomcat failed (recoverable), because of error during request sending (attempt=2)

[Tue May 29 13:22:43.227 2018] [1936:5868] [error] ajp_service::jk_ajp_common.c (2799): (AxonIvyEngine) connecting to tomcat failed (rc=-3, errors=1, client_errors=0).

[Tue May 29 13:22:43.227 2018] [1936:5868] [error] HttpExtensionProc::jk_isapi_plugin.c (2240): service() failed with http error 503

[Tue May 29 13:23:15.651 2018] [1936:5568] [info] TerminateFilter::jk_isapi_plugin.c (2299): Tomcat/ISAPI/isapi_redirector/1.2.42 stopping"

Can you help me to get this thing started?

Thanks in advance and best regards Sebastian

Accepted Answer

Things to check that AJP works properly on the Axon.ivy Engine side:

Check that AJP is Enabled

and verify that you try to connect to the correct Port. By default AJP is enabled and bound to TCP port 8009.

you can the AJP settings in the EngineConfigUI:
or in the Admin UI. See System Properties > Webserver.AJP.Enabled and Webserver.AJP.Port.
changes on these properties (EngineConfigUi oder AdminUI) always require a restart of the Engine to take effect!

Verify that the TCP Port was bound

By default this is TCP Port 8009 which must be bound during the Engine boot and is waiting to receive packets.

on windows: execute netstat
on linux: execute lsof -i
if the port is not bound. Try to log the AJP connector bootstrap to get more results: https://answers.axonivy.com/questions/3318/how-to-log-ajp-connector-bootstrap

Examine IIS <-> Axon.ivyEngine communication

Enable isap-redirect trace logging to examine in detail the communication between the IIS and the Axon.ivy Engine.

Go to your IIS integration directory. By default [engineDir]/misc/iis/isapi_redirect-1.2.42.properties. In a productive installation you hopefully have copied that directory to another location outside your current installation directory.
Adjust the content of the file. Set log_level=debug, save it. And fire a request against the IIS frontend with your browser.

Service Temporarily Unavailable, cant connect to Tomcat

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