Pop3Server Exception

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

Code:

---

Caused by: java.io.EOFException: SSL peer shut down incorrectly

---

I think that's an End of File exception.
Do you have a commercial cert? You may want to reinstall it.
Do you know if it's just one client, or many. If it's many, that may indicate some weird problem with the keystore?

If it's one, try resetting their account on their pop3 client. Is this outlook/windows?

Thanks for the reply.

No we are not using any Commercial Certificates. Just the defaults. This happens with all the pop3 clients. Infact this problem started after one of the administrators accidentally changed the permission on /opt/zimbra folders. I have fixed this by running zmfixperms.

Regards
Gururaj

Great to hear!

Hi

What i meant to say was that i fixed the permissions by running zmfixperms. But
the Pop3Server Exception errors are still there. All the users use Microsoft Outlook to check pop3 accounts. After sometime none of the pop3 users will be able to connect. Though all the zimbra processes still be running.

Does anybody have any suggestions. Please let me know.
Thanks in Advance.

Hi!
I have the same problem. The POP3 server worked perfectly for about 5-6 month. For some reasons I decided to change POP3 SSL port from 7995 to 110 so that remote clients can access the server with an email client to retrieve their emails (some ISP restrict outboud unusual ports like 7995). After I did that everything worked fine for about 2 days and then I started to notice that from time to time many email clients (Outlook express, MS Outlook 2003, Thunderbird, MS Outlook2007) can not retrieve mails anymore. They are saying Connected to mail.domain.com and that's all... after a few moments it went out with time out error.
The only way I know how to fix that is by restarting zimbra.
I have rolled-back the configuration changes and know pop3ssl is listening on 7995 as before the problem (the client are still coming on 110 and the firewall make the port forwarding / nat); however this din not solve the problem. Telnet is always successful in connecting to the pop3 server on 110 or 7995 and so are, apparently the clients but they cannot retrieve emails. The only error I could find somehow connected to this problem is:

2008-03-14 17:34:59,205 INFO [Pop3Server-34] [] pop - connected
2008-03-14 17:34:59,945 INFO [Pop3Server-34] [] ProtocolHandler - Exception occurred while handling connection
javax.net.ssl.SSLException: Unsupported record version Unknown-22.3
at com.sun.net.ssl.internal.ssl.InputRecord.readV3Rec ord(InputRecord.java:375)
at com.sun.net.ssl.internal.ssl.InputRecord.read(Inpu tRecord.java:360)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRec ord(SSLSocketImpl.java:723)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.perform InitialHandshake(SSLSocketImpl.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.java: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 Source)
at java.lang.Thread.run(Thread.java:595)

2008-03-14 17:34:59,945 INFO [Pop3Server-34] [] ProtocolHandler - Handler exiting normally

Can anybody help?

Thanks,

I have the same problem...