Hi,

we're running 6.18.2 Rev14 (singleserver) on CentOS5. Obviously, the system runs quiet well.
We have some Samsung Tabs connected.
But every 120 seconds we get following exception:

Code:
FINE: remost host register request: HOST=localhost/127.0.0.1,PORT=44335,TIMER=Tue Jan 04 15:37:53 CET 2011
Jan 4, 2011 3:37:55 PM com.openexchange.usm.session.impl.SessionImpl waitForChanges
FINE: 1:3:chrkon00:EAS:androidc465501497 Performing email pull
Jan 4, 2011 3:37:55 PM com.openexchange.usm.session.impl.SessionImpl waitForChanges
FINE: 1:3:chrkon00:EAS:androidc465501497 waitforChanges Result=FolderChanges: false, ContentChanges: [default0/INBOX]
Jan 4, 2011 3:37:55 PM com.openexchange.usm.eas.servlet.EASServlet logResponse
FINE: 1:3:chrkon00:EAS:androidc465501497: Ping executed in 235485 ms, 25 OX calls took 472 ms.
Jan 4, 2011 3:37:55 PM com.openexchange.usm.database.ox.OXDBService getWritable
FINE: Retrieving read/write JDBC Connection for 1
Jan 4, 2011 3:37:55 PM com.openexchange.usm.database.ox.OXDBService backWritable
FINE: Releasing read/write JDBC Connection for 1
Jan 4, 2011 3:37:55 PM com.openexchange.ajp13.AJPv13ServletOutputStream responseToWebServer
WARNING: Underlying (TCP) protocol communication aborted: Broken pipe
java.net.SocketException: Broken pipe
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(Unknown Source)
	at java.net.SocketOutputStream.write(Unknown Source)
	at com.openexchange.ajp13.BlockableBufferedOutputStream.flushBuffer(BlockableBufferedOutputStream.java:154)
	at com.openexchange.ajp13.BlockableBufferedOutputStream.flush(BlockableBufferedOutputStream.java:227)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.responseToWebServer(AJPv13ServletOutputStream.java:291)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.flush2WebServer(AJPv13ServletOutputStream.java:265)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.close(AJPv13ServletOutputStream.java:126)
	at com.openexchange.usm.util.Toolkit.close(Toolkit.java:70)
	at com.openexchange.usm.eas.servlet.EASServlet.doPost(EASServlet.java:367)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:616)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.doServletService(AJPv13RequestHandlerImpl.java:517)
	at com.openexchange.ajp13.AJPv13Request.response(AJPv13Request.java:129)
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.createResponse(AJPv13RequestHandlerImpl.java:329)
	at com.openexchange.ajp13.najp.AJPv13ConnectionImpl.createResponse(AJPv13ConnectionImpl.java:235)
	at com.openexchange.ajp13.najp.AJPv13Task.call(AJPv13Task.java:352)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.runTask(CustomThreadPoolExecutor.java:750)
	at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.run(CustomThreadPoolExecutor.java:776)
	at java.lang.Thread.run(Unknown Source)
Jan 4, 2011 3:37:55 PM com.openexchange.ajp13.AJPv13ServletOutputStream responseToWebServer
WARNING: Underlying (TCP) protocol communication aborted: Broken pipe
java.net.SocketException: Broken pipe
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(Unknown Source)
	at java.net.SocketOutputStream.write(Unknown Source)
	at com.openexchange.ajp13.BlockableBufferedOutputStream.flushBuffer(BlockableBufferedOutputStream.java:154)
	at com.openexchange.ajp13.BlockableBufferedOutputStream.flush(BlockableBufferedOutputStream.java:227)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.responseToWebServer(AJPv13ServletOutputStream.java:291)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.flush2WebServer(AJPv13ServletOutputStream.java:265)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.flush(AJPv13ServletOutputStream.java:113)
	at com.openexchange.tools.servlet.ServletResponseWrapper.flushBuffer(ServletResponseWrapper.java:169)
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.doResponseFlush(AJPv13RequestHandlerImpl.java:537)
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.doServletService(AJPv13RequestHandlerImpl.java:523)
	at com.openexchange.ajp13.AJPv13Request.response(AJPv13Request.java:129)
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.createResponse(AJPv13RequestHandlerImpl.java:329)
	at com.openexchange.ajp13.najp.AJPv13ConnectionImpl.createResponse(AJPv13ConnectionImpl.java:235)
	at com.openexchange.ajp13.najp.AJPv13Task.call(AJPv13Task.java:352)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.runTask(CustomThreadPoolExecutor.java:750)
	at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.run(CustomThreadPoolExecutor.java:776)
	at java.lang.Thread.run(Unknown Source)
Jan 4, 2011 3:37:55 PM com.openexchange.ajp13.najp.AJPv13Task call
SEVERE: AJP-0016 Category=6 Message=An I/O error occurred: Broken pipe exceptionID=-1575244142-201
AJP-0016 Category=6 Message=An I/O error occurred: Broken pipe exceptionID=-1575244142-201
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.createResponse(AJPv13RequestHandlerImpl.java:331)
	at com.openexchange.ajp13.najp.AJPv13ConnectionImpl.createResponse(AJPv13ConnectionImpl.java:235)
	at com.openexchange.ajp13.najp.AJPv13Task.call(AJPv13Task.java:352)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.runTask(CustomThreadPoolExecutor.java:750)
	at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.run(CustomThreadPoolExecutor.java:776)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Broken pipe
	at com.openexchange.ajp13.AJPv13ServletOutputStream.responseToWebServer(AJPv13ServletOutputStream.java:302)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.flush2WebServer(AJPv13ServletOutputStream.java:265)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.flush(AJPv13ServletOutputStream.java:113)
	at com.openexchange.tools.servlet.ServletResponseWrapper.flushBuffer(ServletResponseWrapper.java:169)
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.doResponseFlush(AJPv13RequestHandlerImpl.java:537)
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.doServletService(AJPv13RequestHandlerImpl.java:523)
	at com.openexchange.ajp13.AJPv13Request.response(AJPv13Request.java:129)
	at com.openexchange.ajp13.najp.AJPv13RequestHandlerImpl.createResponse(AJPv13RequestHandlerImpl.java:329)
	... 7 more
Caused by: java.net.SocketException: Broken pipe
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(Unknown Source)
	at java.net.SocketOutputStream.write(Unknown Source)
	at com.openexchange.ajp13.BlockableBufferedOutputStream.flushBuffer(BlockableBufferedOutputStream.java:154)
	at com.openexchange.ajp13.BlockableBufferedOutputStream.flush(BlockableBufferedOutputStream.java:227)
	at com.openexchange.ajp13.AJPv13ServletOutputStream.responseToWebServer(AJPv13ServletOutputStream.java:291)
	... 14 more
Jan 4, 2011 3:37:55 PM com.openexchange.ajp13.najp.AJPv13ConnectionImpl resetConnection
SEVERE: Broken pipe
java.net.SocketException: Broken pipe
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(Unknown Source)
	at java.net.SocketOutputStream.write(Unknown Source)
	at com.openexchange.ajp13.BlockableBufferedOutputStream.flushBuffer(BlockableBufferedOutputStream.java:154)
	at com.openexchange.ajp13.BlockableBufferedOutputStream.flush(BlockableBufferedOutputStream.java:227)
	at com.openexchange.ajp13.najp.AJPv13ConnectionImpl.resetConnection(AJPv13ConnectionImpl.java:175)
	at com.openexchange.ajp13.najp.AJPv13ConnectionImpl.close(AJPv13ConnectionImpl.java:348)
	at com.openexchange.ajp13.najp.AJPv13Task.terminateAndClose(AJPv13Task.java:554)
	at com.openexchange.ajp13.najp.AJPv13Task.call(AJPv13Task.java:427)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.runTask(CustomThreadPoolExecutor.java:750)
	at com.openexchange.threadpool.internal.CustomThreadPoolExecutor$Worker.run(CustomThreadPoolExecutor.java:776)
	at java.lang.Thread.run(Unknown Source)
Jan 4, 2011 3:37:59 PM com.openexchange.push.udp.PushOutputQueue run
FINE: get push objects from queue: 2
Jan 4, 2011 3:38:01 PM com.openexchange.usm.eas.servlet.EASServlet doPost
FINE: HTTP POST command:Ping, user:chrkon00, deviceId:androidc465501497, deviceType:Android
Jan 4, 2011 3:38:01 PM com.openexchange.usm.database.ox.OXDBService getReadOnly
FINE: Retrieving read only JDBC Connection for 1
Cyrus is connected through internal openVPN tap device.

netstat -tlpn:
Code:
       
tcp        0      0 127.0.0.1:3306                0.0.0.0:*                   LISTEN      15463/mysqld        
tcp        0      0 127.0.0.1:1099              0.0.0.0:*                   LISTEN      15507/java          
tcp        0      0 127.0.0.1:9998              0.0.0.0:*                   LISTEN      15507/java          
tcp        0      0 0.0.0.0:59408               0.0.0.0:*                   LISTEN      15507/java          
tcp        0      0 0.0.0.0:57461               0.0.0.0:*                   LISTEN      15507/java          
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      1047/sendmail: acce 
tcp        0      0 :::58849                    :::*                        LISTEN      8730/java           
tcp        0      0 :::52514                    :::*                        LISTEN      8730/java           
tcp        0      0 ::ffff:127.0.0.1:8009       :::*                        LISTEN      8730/java           
tcp        0      0 ::ffff:127.0.0.1:9999       :::*                        LISTEN      8730/java           
tcp        0      0 :::80                       :::*                        LISTEN      5956/httpd          
tcp        0      0 :::57462                    :::*                        LISTEN      8730/java           
tcp        0      0 :::22                       :::*                        LISTEN      1029/sshd           
tcp        0      0 :::443                      :::*                        LISTEN      5956/httpd
Any suggestions? I suppose it's an android issue.
Regards
Chris