Hi

I use a virtualized server (Red Hat 4.1.2-46) to run Zimbra 7.2.0_GA_2669. Everything worked fine for months. But since a couple of hours, the web interface (both user and admin) cannot be accessed anymore. If you try to open it in a browser, it's loading endlessly; finally giving a timeout message. If you use get, the result is a 302 Moved Permanently.

The server's SSL certificates are invalid since they expired in April, but this has not been a problem before.

Zimbra service is running as it should:

Code:
Host zimbra.server.com
        antispam                Running
        antivirus               Running
        ldap                    Running
        logger                  Running
        mailbox                 Running
        memcached               Running
        mta                     Running
        spell                   Running
        stats                   Stopped
        zmconfigd               Running
As I'm quite a Zimbra newbie, here's the last content of the log file:

Code:
Sep 22 00:00:59 lvps176-28-12-92 postfix/error[32500]: DA334DA811D: to=<specific-address-9@server.com>, relay=none, delay=96934, delays=96934/0.04/0/0, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:00:59 lvps176-28-12-92 postfix/error[32501]: 0F763DA811E: to=<specific-address-9@server.com>, relay=none, delay=92944, delays=92944/0.04/0/0, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:00:59 lvps176-28-12-92 postfix/error[32502]: D19611576CAC2: to=<specific-address-9@server.com>, relay=none, delay=113719, delays=113719/0.03/0/0, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:00:59 lvps176-28-12-92 postfix/error[32501]: 0F763DA811E: to=<specific-address@server.com>, relay=none, delay=92944, delays=92944/0.04/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:00:59 lvps176-28-12-92 postfix/error[32500]: DA334DA811D: to=<specific-address@server.com>, relay=none, delay=96934, delays=96934/0.04/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:00:59 lvps176-28-12-92 postfix/error[32502]: D19611576CAC2: to=<specific-address@server.com>, relay=none, delay=113719, delays=113719/0.03/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:01:26 lvps176-28-12-92 postfix/smtpd[32504]: warning: #ip-address#: hostname #ip-address#.srvlist.ukfast.net verification failed: Name or service not known
Sep 22 00:01:26 lvps176-28-12-92 postfix/smtpd[32504]: connect from unknown[#ip-address#]
Sep 22 00:01:26 lvps176-28-12-92 postfix/smtpd[32504]: setting up TLS connection from unknown[#ip-address#]
Sep 22 00:01:26 lvps176-28-12-92 postfix/smtpd[32504]: Anonymous TLS connection established from unknown[#ip-address#]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Sep 22 00:01:26 lvps176-28-12-92 saslauthd[5854]: zmauth: authenticating against elected url 'https://zimbra.server.com:7071/service/admin/soap/' ...
Sep 22 00:01:41 lvps176-28-12-92 saslauthd[5854]: authentication against url 'https://zimbra.server.com:7071/service/admin/soap/' caused error 'curl_easy_perform: error(28): SSL connection timeout'
Sep 22 00:01:41 lvps176-28-12-92 saslauthd[5854]: url 'https://zimbra.server.com:7071/service/admin/soap/' will not be used for (at least) 600 seconds
Sep 22 00:01:41 lvps176-28-12-92 saslauthd[5854]: Authentication cycle re-elected url https://zimbra.server.com:7071/service/admin/soap/, giving up ...
Sep 22 00:01:41 lvps176-28-12-92 saslauthd[5854]: auth_zimbra: internet auth failed: curl_easy_perform: error(28): SSL connection timeout
Sep 22 00:01:41 lvps176-28-12-92 saslauthd[5854]: do_auth         : auth failure: [user=internet] [service=smtp] [realm=] [mech=zimbra] [reason=Unknown]
Sep 22 00:01:41 lvps176-28-12-92 postfix/smtpd[32504]: warning: unknown[#ip-address#]: SASL LOGIN authentication failed: authentication failure
Sep 22 00:01:41 lvps176-28-12-92 postfix/smtpd[32504]: lost connection after RSET from unknown[#ip-address#]
Sep 22 00:01:41 lvps176-28-12-92 postfix/smtpd[32504]: disconnect from unknown[#ip-address#]
Sep 22 00:02:06 lvps176-28-12-92 zmmailboxdmgr[32757]: status requested
Sep 22 00:02:06 lvps176-28-12-92 zmmailboxdmgr[32757]: status OK
Sep 22 00:04:05 lvps176-28-12-92 zmmailboxdmgr[1399]: status requested
Sep 22 00:04:05 lvps176-28-12-92 zmmailboxdmgr[1399]: status OK
Sep 22 00:04:27 lvps176-28-12-92 postfix/smtpd[1515]: warning: #ip-address#: hostname #ip-address#.srvlist.ukfast.net verification failed: Name or service not known
Sep 22 00:04:27 lvps176-28-12-92 postfix/smtpd[1515]: connect from unknown[#ip-address#]
Sep 22 00:04:27 lvps176-28-12-92 postfix/smtpd[1515]: setting up TLS connection from unknown[#ip-address#]
Sep 22 00:04:27 lvps176-28-12-92 postfix/smtpd[1515]: Anonymous TLS connection established from unknown[#ip-address#]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Sep 22 00:04:27 lvps176-28-12-92 saslauthd[5856]: zmauth: authenticating against elected url 'https://zimbra.server.com:7071/service/admin/soap/' ...
Sep 22 00:04:42 lvps176-28-12-92 saslauthd[5856]: authentication against url 'https://zimbra.server.com:7071/service/admin/soap/' caused error 'curl_easy_perform: error(28): SSL connection timeout'
Sep 22 00:04:42 lvps176-28-12-92 saslauthd[5856]: url 'https://zimbra.server.com:7071/service/admin/soap/' will not be used for (at least) 600 seconds
Sep 22 00:04:42 lvps176-28-12-92 saslauthd[5856]: Authentication cycle re-elected url https://zimbra.server.com:7071/service/admin/soap/, giving up ...
Sep 22 00:04:42 lvps176-28-12-92 saslauthd[5856]: auth_zimbra: internet auth failed: curl_easy_perform: error(28): SSL connection timeout
Sep 22 00:04:42 lvps176-28-12-92 saslauthd[5856]: do_auth         : auth failure: [user=internet] [service=smtp] [realm=] [mech=zimbra] [reason=Unknown]
Sep 22 00:04:42 lvps176-28-12-92 postfix/smtpd[1515]: warning: unknown[#ip-address#]: SASL LOGIN authentication failed: authentication failure
Sep 22 00:04:42 lvps176-28-12-92 postfix/smtpd[1515]: lost connection after RSET from unknown[#ip-address#]
Sep 22 00:04:42 lvps176-28-12-92 postfix/smtpd[1515]: disconnect from unknown[#ip-address#]
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: 7E3BBDA8023: from=<#sendermail-1#>, size=60484, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: 815761576CAC4: from=<#sendermail-2#>, size=763920, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: AC1261576CA8E: from=<#sendermail-3#>, size=342084, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: BA13A1576CB1E: from=<#sendermail-4#>, size=10206, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: B35E61576CA7F: from=<#sendermail-5#>, size=2224, nrcpt=2 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: EF3B51576CB1F: from=<#sendermail-6#>, size=8326, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: E5BD2DA8125: from=<zimbra@srv1.server.com>, size=28144, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: F0630DA8025: from=<#sendermail-7#>, size=752353, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: 441DFDA8027: from=<#sendermail-8#>, size=7933, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: CB4031576CA4F: from=<#sendermail-9#>, size=1802, nrcpt=2 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: CB8B7DA814E: from=<>, size=1717, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: D7E0FDA8153: from=<zimbra@srv1.server.com>, size=19577, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: 564FA1576CA94: from=<specific-address-3@server.com>, size=183954, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: 9CBFBDA8026: from=<#sendermail-10#>, size=36416, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: 22D1E628008: from=<#sendermail-11#>, size=15180, nrcpt=2 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: 2C698628007: from=<#sendermail-12#>, size=8105, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/qmgr[5845]: 22D831576CA86: from=<specific-address-2@server.com>, size=243996, nrcpt=1 (queue active)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1537]: 815761576CAC4: to=<specific-address-5@server.com>, relay=none, delay=113778, delays=113778/0.02/0/0.18, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1536]: 7E3BBDA8023: to=<specific-address-4@server.com>, relay=none, delay=109744, delays=109744/0.03/0/0.19, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1539]: AC1261576CA8E: to=<specific-address-3@server.com>, relay=none, delay=118040, delays=118039/0.02/0/0.18, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1540]: BA13A1576CB1E: to=<specific-address-8@server.com>, relay=none, delay=76125, delays=76124/0.04/0/0.16, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1543]: B35E61576CA7F: to=<specific-address-9@server.com>, relay=none, delay=84555, delays=84554/0.04/0/0.16, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1536]: E5BD2DA8125: to=<admin@server.com>, relay=none, delay=88543, delays=88543/0.19/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1543]: B35E61576CA7F: to=<specific-address@server.com>, relay=none, delay=84555, delays=84554/0.04/0/0.16, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1539]: F0630DA8025: to=<specific-address@server.com>, relay=none, delay=109693, delays=109693/0.19/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1537]: EF3B51576CB1F: to=<specific-address-8@server.com>, relay=none, delay=76124, delays=76124/0.19/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1540]: 441DFDA8027: to=<specific-address-9@server.com>, relay=none, delay=109545, delays=109545/0.19/0/0, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1540]: CB8B7DA814E: to=<specific-address@server.com>, relay=none, delay=12992, delays=12992/0.18/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1536]: D7E0FDA8153: to=<admin@server.com>, relay=none, delay=2145, delays=2145/0.18/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1537]: CB4031576CA4F: to=<specific-address-9@server.com>, relay=none, delay=105591, delays=105591/0.19/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1543]: 9CBFBDA8026: to=<specific-address-9@server.com>, relay=none, delay=109636, delays=109635/0.18/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1539]: 564FA1576CA94: to=<specific-address-7@server.com>, relay=none, delay=118067, delays=118067/0.18/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1539]: 2C698628007: to=<specific-address-9@server.com>, relay=none, delay=124669, delays=124669/0.18/0/0, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1537]: CB4031576CA4F: to=<specific-address@server.com>, relay=none, delay=105591, delays=105591/0.19/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1547]: 22D1E628008: to=<specific-address-6@server.com>, relay=none, delay=124556, delays=124556/0.18/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1548]: 22D831576CA86: to=<specific-address-6@server.com>, relay=none, delay=118195, delays=118195/0.18/0/0, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:05:58 lvps176-28-12-92 postfix/error[1547]: 22D1E628008: to=<specific-address@server.com>, relay=none, delay=124556, delays=124556/0.18/0/0.01, dsn=4.0.0, status=deferred (delivery temporarily suspended: host zimbra.server.com[#ip-address-mailserver#] refused to talk to me: 421 zimbra.server.com Zimbra LMTP server closing connection; service busy)
Sep 22 00:06:05 lvps176-28-12-92 zmmailboxdmgr[1811]: status requested
Sep 22 00:06:05 lvps176-28-12-92 zmmailboxdmgr[1811]: status OK
Sep 22 00:06:33 lvps176-28-12-92 postfix/anvil[17531]: statistics: max connection rate 1/60s for (#ip-address-mailserver#:submission:#ip-address#) at Sep 21 23:58:27
Sep 22 00:06:33 lvps176-28-12-92 postfix/anvil[17531]: statistics: max connection count 1 for (#ip-address-mailserver#:submission:#ip-address#) at Sep 21 23:58:27
Sep 22 00:06:33 lvps176-28-12-92 postfix/anvil[17531]: statistics: max cache size 2 at Sep 21 23:59:06
Sep 22 00:07:26 lvps176-28-12-92 postfix/smtpd[1950]: warning: #ip-address#: hostname #ip-address#.srvlist.ukfast.net verification failed: Name or service not known
Sep 22 00:07:26 lvps176-28-12-92 postfix/smtpd[1950]: connect from unknown[#ip-address#]
Sep 22 00:07:26 lvps176-28-12-92 postfix/smtpd[1950]: setting up TLS connection from unknown[#ip-address#]
Sep 22 00:07:27 lvps176-28-12-92 postfix/smtpd[1950]: Anonymous TLS connection established from unknown[#ip-address#]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Sep 22 00:07:27 lvps176-28-12-92 saslauthd[5854]: zmauth: authenticating against elected url 'https://zimbra.server.com:7071/service/admin/soap/' ...
Sep 22 00:07:42 lvps176-28-12-92 saslauthd[5854]: authentication against url 'https://zimbra.server.com:7071/service/admin/soap/' caused error 'curl_easy_perform: error(28): SSL connection timeout'
Sep 22 00:07:42 lvps176-28-12-92 saslauthd[5854]: url 'https://zimbra.server.com:7071/service/admin/soap/' will not be used for (at least) 600 seconds
Sep 22 00:07:42 lvps176-28-12-92 saslauthd[5854]: Authentication cycle re-elected url https://zimbra.server.com:7071/service/admin/soap/, giving up ...
Sep 22 00:07:42 lvps176-28-12-92 saslauthd[5854]: auth_zimbra: internet auth failed: curl_easy_perform: error(28): SSL connection timeout
Sep 22 00:07:42 lvps176-28-12-92 saslauthd[5854]: do_auth         : auth failure: [user=internet] [service=smtp] [realm=] [mech=zimbra] [reason=Unknown]
Sep 22 00:07:42 lvps176-28-12-92 postfix/smtpd[1950]: warning: unknown[#ip-address#]: SASL LOGIN authentication failed: authentication failure
Sep 22 00:07:42 lvps176-28-12-92 postfix/smtpd[1950]: lost connection after RSET from unknown[#ip-address#]
Sep 22 00:07:42 lvps176-28-12-92 postfix/smtpd[1950]: disconnect from unknown[#ip-address#]
Sep 22 00:08:06 lvps176-28-12-92 zmmailboxdmgr[3245]: status requested
Sep 22 00:08:06 lvps176-28-12-92 zmmailboxdmgr[3245]: status OK
I'm not too fond of the idea to restart the service before figuring out what the problem is - I just don't want it to get worse. Any ideas? Thanks a lot!