Thanks for your help.  We are going to upgrade to 6.0.26 and see if
the issue goes away.  I will update next week with the status of the
issue.

On Mon, May 17, 2010 at 9:45 AM, Konstantin Kolinko
<knst.koli...@gmail.com> wrote:
> 2010/5/17 Richard Sayre <richardsa...@gmail.com>:
>> Hi,
>>
>> Lately in my production environment I am getting "URL is unavailable"
>> in my browser when I try to hit the site.
>>
>> I found the following in the catalina.log file:
>>
>> SEVERE: Protocol handler pause failed
>> java.net.ConnectException: Connection refused: connect
>>        (...)
>>        at java.net.Socket.<init>(Unknown Source)
>>        at 
>> org.apache.jk.common.ChannelSocket.unLockSocket(ChannelSocket.java:486)
>>        at org.apache.jk.common.ChannelSocket.pause(ChannelSocket.java:283)
>>        at org.apache.jk.server.JkMain.pause(JkMain.java:681)
>>        at 
>> org.apache.jk.server.JkCoyoteHandler.pause(JkCoyoteHandler.java:153)
>
> IIRC, the above unLock call is just a tool to speedup the shutdown
> process. Even if it fails, it is not a big concern.
>
>> I am using Tomcat 6.0.14.
>> Any suggestions?
>
> Plan for upgrade, to 6.0.26 or to 6.0.27 when it comes out.
>
> 6.0.14 is several years old and IIRC there were some changes to the
> shutdown process, that might affect the above issue.
>
>> I forgot to mention java 1.6.0_18
>> Windows Server 2003
>
> Thank you for following up to provide the above details. It is appreciated.
>
> The unlock call establishes a connection to the port where connector
> listens for the incoming connections. That will unlock the thread that
> waits for them on the socket, allowing it to shutdown immediately.
>
> It would be a concern if external connections to Tomcat fail. (But if
> they do, it would be one of the reasons to restart Tomcat).
>
>
> Best regards,
> Konstantin Kolinko
>
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