Hello All,
We are running ZCS 4.5.1 OpenSource Edition on RedHat Ent 4 for quite sometime. Of late we are facing some problem particularly with pop3 users. Getting error "ProtocolHandler - Exception occurred while handling connection"
whenever a user tries to connect. If i restart zimbra services problem goes away for a while and again starts after sometime. Please see the error from /opt/zimbra/log/mailbox.log below. Appreciate any help.

2007-06-14 08:15:50,790 INFO [IndexWritersSweeper] [] MailboxIndex - open index
writers sweep: before=15, closed=0, after=15 (0ms)
2007-06-14 08:16:29,750 INFO [Pop3Server-40] [] pop - connected
2007-06-14 08:16:29,753 INFO [Pop3Server-40] [] ProtocolHandler - Exception occ
urred while handling connection
javax.net.ssl.SSLHandshakeException: Remote host closed connection during handsh
ake
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRec ord(SSLSocketImpl.j
ava:742)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.perform InitialHandshake(SS
LSocketImpl.java:1030)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRe cord(SSLSocketImpl.
java:622)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write (AppOutputStream.ja
va:59)
at java.io.BufferedOutputStream.flushBuffer(BufferedO utputStream.java:65
)
at java.io.BufferedOutputStream.flush(BufferedOutputS tream.java:123)
at com.zimbra.cs.pop3.Pop3Handler.sendLine(Pop3Handle r.java:382)
at com.zimbra.cs.pop3.Pop3Handler.sendResponse(Pop3Ha ndler.java:371)
at com.zimbra.cs.pop3.Pop3Handler.sendOK(Pop3Handler. java:354)
at com.zimbra.cs.pop3.Pop3Handler.setupConnection(Pop 3Handler.java:115)
at com.zimbra.cs.tcpserver.ProtocolHandler.run(Protoc olHandler.java:196)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Wo rker.run(Unknown So
urce)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.io.EOFException: SSL peer shut down incorrectly
at com.sun.net.ssl.internal.ssl.InputRecord.read(Inpu tRecord.java:333)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRec ord(SSLSocketImpl.j
ava:723)
... 12 more

Thanks and Regards
Gururaj