tomcat-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Cohen, Laurence" <lco...@novetta.com>
Subject Re: Help with Tomcat Applications not listening
Date Wed, 02 Sep 2015 20:57:40 GMT
1. apache httpd 2.2.x
2. mod_proxy_httpd
3. I'll have to clean up this information.
4. 7.0.59, jdk 1.8u51
5. I'll have to clean up this information.
6. Yes, we have iptables running on both the app server and web server but
even when we shut them down we still have the problem.

I'll send 3 and 5 as soon as possible.

Thanks,

Larry

On Wed, Sep 2, 2015 at 4:39 PM, Mark Eggers <its_toasted@yahoo.com.invalid>
wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Larry,
>
> On 9/2/2015 12:54 PM, Cohen, Laurence wrote:
> > Hi,
> >
> > We have a webserver and an appserver, and the webserver talks to
> > the appserver on port 8007.  Every once the communication will
> > stop, and we will notice an error on the webserver saying that it
> > can't talk to the appserver.  When this happens, I will run a
> > netstat -an |grep 8007 on the appserver, and there are hundreds of
> > connections to that port.  When I restart the app, it will be back
> > to about 10 connections, and they will start growing again.
> >
> > I'm trying to figure out why they are growing so quickly, and why
> > they aren't dying when the connection is no longer needed.
> >
> > Any help would be appreciated.
> >
> > Thanks,
> >
> > Larry Cohen
> >
>
> Unfortunately, I don't have Pid's crystal ball. A little more
> information is needed.
>
> 1. web server information
>    (platform, web server software, version)
> 2. method of web server - app server connection
>    (mod_jk, mod_proxy_ajp, mod_proxy_http)
> 3. Configuration for the connection
> 4. Tomcat information
>    (platform, Java, version)
> 5. Connector configuration
> 6. Any intervening firewalls that might try to be "helpful"
>
> I'm guessing that something is keeping the connections active, or that
> there are no timeouts configured.
>
> It could also be a DOS attack.
>
> What does your application do (in general)? Can you replicate this
> problem in a test environment simulating normal (expected) traffic?
>
> . . . lots of questions, not a lot of answers
> /mde/
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v2
>
> iQEcBAEBAgAGBQJV515nAAoJEEFGbsYNeTwtORoH+gKHsKGdvE0h455iNb1agNQS
> xjoF8kFd/turT2mfZaMnwhgJWi8qQekIWK+x0f1qgssYKytiBr5YcMwdUfOSv4l3
> bJK175qdpg2Vq4KvuYmEZnAQZCL99oDPhXWPLqQMmfRWgZBkU2neg3GMj+b5uyI1
> XZUxkezuhHIckSc8Rdc7JQ8KLPyFfm4ONWEKiN7L1Q6ZyHm9J9EL/0vOsrBr2x8g
> aer/VPM6bZ5W3BY0VSeYRGyykcpnU9GgapJ4xIW6kqgVGdbdYN+X39XxoJ2YQ9nl
> h76z2F4GkoItm1uOCT/1kDiqDxDutNXwxI5k5tswnN9SFBZgykFaiWR9a7mVfzI=
> =W4h4
> -----END PGP SIGNATURE-----
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>


-- 

[image: www.novetta.com]

Larry Cohen

System Administrator


12021 Sunset Hills Road, Suite 400

Reston, VA 20190

Email  lcohen@novetta.com

Office  703-885-1064

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message