ColdFusion 2021 Apache connector or Apache not closing connections

[Dan Mather]

Centos 7.9

ColdFusion 2021 w/ Update1

Apache 2.4.6

Connector version:321158

I have noticed that when using Apache via the connector to serve ColdFusion pages that over time the server quits responding.  Looking in the mod_jk.log I see:

[info] ajp_connection_tcp_get_message::jk_ajp_common.c (1443) : (cfusion) can't receive the response header message from tomcat, tomcat (127.0.0.1:8020) has forced a connection close for socket 13

[error] ajp_get_reply:: jk_ajp_common.c (2420) : (cfusion) Tomcat is down or refused connection. No response has been sent to the client (yet)

[info] ajp_service::jk_ajp_common.c (3000) : (cfusion) sending request to tomcat failed (recoverable),  (attempt=1)

Checking netstat I see thousands of connections in the CLOSE_WAIT state.  

Restarting Apache does not clear the hung sockets

Restarting ColdFusion does clear them

Using the built-in Tomcat server on port 8500 I do not see this issue.

Is this an Apache problem or a connector problem?

Thanks,

Dan Mather

[Dan Mather]

Update --I ran the Apache Server Status and can see Apache is running just fine -it closes the connection and frees the child processes.  From the Apache perspective things are fine.

This leads me to suspect the connector is not closing the connection.

Dan

[Dan Mather · Accepted solution]

I installed a previous version of the connector and the issue seems to have gone away (I had received serveral engineeering versions trying to resolve a different problem.)  All is well now.

Dan Mather

[PossumJohn]

Good afternoon!
Is there more information on this issue available?  We're running CF-2021 on a Solaris server.  Which version of WSConfig is current & which is the previous version?  Where can we get the previous version?  Any info on this issue would be most helpful.

Thanks!
V/R
John

[Charlie Arehart]

I can answer the last question of yours, John.

1) First, note that the connector file (mod_jk.so) for each update can be found in the wsconfig.jar file (which is just a comoressed/zip file). If you extract or explore into it, you'll find that file for different OSs.

The current one (for whatever cf update you're on) would be in the wsconfig.jar in the cfusion/runtime/lib folder.

2) Previous versions of that file (for each past update you've applied) would be in the backup of the next update. So if you're on cf2018 update 11, for instance, when you applied that it created a folder for that update 11 in your cfusion/hf-updates folder. In that is a backup folder, and in that are whatever files you had before that the update changes.

So you could find your previous runtime/lib/wsconfig.jar there.

3) But you may want to find one for an earlier update that you did not apply.

For that, you could download whatever past update you want via the technote for that update (which you can find via web search). That will itself be a jar you could extract.

Sorry, but there is no simple repo of past connectors, on their own.

I hope others may answer your other questions. 

[PossumJohn]

Thanks Charlie!  🙂