Tomcat error “Protocol handler pause failed” when sometimes restarting the app

Question

Sometimes when we run an automatic script to restart Tomcat, that runs catalina.sh stop then catalina.sh start. Sometimes we get the following error:

Jan 3, 2012 11:40:55 AM org.apache.catalina.connector.Connector pause
SEVERE: Protocol handler pause failed
java.net.ConnectException: Connection timed out
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at java.net.Socket.connect(Socket.java:478)
        at java.net.Socket.<init>(Socket.java:375)
        at java.net.Socket.<init>(Socket.java:218)
        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)
        at org.apache.catalina.connector.Connector.pause(Connector.java:1073)
        at org.apache.catalina.core.StandardService.stop(StandardService.java:563)
        at org.apache.catalina.core.StandardServer.stop(StandardServer.java:744)
        at org.apache.catalina.startup.Catalina.stop(Catalina.java:628)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:603)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Jan 3, 2012 11:40:56 AM org.apache.catalina.core.StandardService stop
INFO: Stopping service Catalina

What specifically does this say the problem is? After seeing our app not come up, we restart it again - or just run catalina.sh start - and everything is fine.