Guam Terminates periodically - no IMAP access possible

[kolab]

Hello everyone,

we are experiencing major Problems with GUAM after installing kolab 16 on centos 7.

There is no access is possible from roundcube mail after the system worked for a while

The roundcube mail log says:
Could not connect to localhost:143: Verbindungsaufbau abgelehnt in /usr/share/roundcubemail

Netstat -anp | grep 143  tells me that no listener for port 143 is there

After restarting GUAM everything works again for a week, then another crash happens.

The guam crash log tells me this:

2016-03-26 01:49:03 =ERROR REPORT====
** Generic server <0.9384.0> terminating
** Last message in was {'$gen_cast',accept}
** When Server state == {state,{sslsocket,nil,{#Port<0.1369>,{config,{ssl_options,tls,[{3,3},{3,2},{3,1}],verify_none,{#Fun<ssl.7.6129212>,[]},#Fun<ssl.8.6129212>,false,false,undefined,1,<<"/etc/pki/cyrus-imapd/cyrus-imapd.pem">>,undefi$
** Reason for termination ==
** {function_clause,[{inet,tcp_close,[{sslsocket,nil,{#Port<0.1369>,{config,{ssl_options,tls,[{3,3},{3,2},{3,1}],verify_none,{#Fun<ssl.7.6129212>,[]},#Fun<ssl.8.6129212>,false,false,undefined,1,<<"/etc/pki/cyrus-imapd/cyrus-imapd.pem">>$
2016-03-26 01:49:03 =CRASH REPORT====
  crasher:
    initial call: kolab_guam_session:init/1
    pid: <0.9384.0>
    registered_name: []
    exception exit: {{function_clause,[{inet,tcp_close,[{sslsocket,nil,{#Port<0.1369>,{config,{ssl_options,tls,[{3,3},{3,2},{3,1}],verify_none,{#Fun<ssl.7.6129212>,[]},#Fun<ssl.8.6129212>,false,false,undefined,1,<<"/etc/pki/cyrus-imapd/$
    ancestors: [<0.91.0>,kolab_guam_sup,<0.86.0>]
    messages: []
    links: [<0.91.0>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 1598
    stack_size: 27
    reductions: 280
  neighbours:
2016-03-26 01:49:03 =SUPERVISOR REPORT====
     Supervisor: {<0.91.0>,kolab_guam_listener}
     Context:    child_terminated
     Reason:     {function_clause,[{inet,tcp_close,[{sslsocket,nil,{#Port<0.1369>,{config,{ssl_options,tls,[{3,3},{3,2},{3,1}],verify_none,{#Fun<ssl.7.6129212>,[]},#Fun<ssl.8.6129212>,false,false,undefined,1,<<"/etc/pki/cyrus-imapd/cyru$
     Offender:   [{pid,<0.9384.0>},{name,session},{mfargs,{kolab_guam_session,start_link,undefined}},{restart_type,temporary},{shutdown,1000},{child_type,worker}]

Can you tell me what to do?

Greetings,
Juri

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