[horde] Webinterface Conntection Error

[Jens Hellermann]

Hi there!

I'm having a small problem since friday, that my horde webmail interface 
often looses the connection to the server. I find following entries in 
the lighhtpd error.log :

2015-10-06 09:15:57: (connections.c.1715) SSL (error): 5 -1 104 
Connection reset by peer
2015-10-06 09:18:34: (mod_fastcgi.c.2676) FastCGI-stderr: PHP Fatal 
error:  Uncaught exception 'Horde_Imap_Client_Exception' with message 
'Mail server closed the connection unexpectedly.' $
Stack trace:
#0 /usr/share/php/Horde/Imap/Client/Socket.php(4529): 
Horde_Imap_Client_Socket_Connection_Socket->read()
#1 /usr/share/php/Horde/Imap/Client/Socket.php(4301): 
Horde_Imap_Client_Socket->_getLine(Object(Horde_Imap_Client_Interaction_Pipeline))
#2 /usr/share/php/Horde/Imap/Client/Socket.php(4229): 
Horde_Imap_Client_Socket->_sendCmdChunk(Object(Horde_Imap_Client_Interaction_Pipeline), 
Array)
#3 /usr/share/php/Horde/Imap/Client/Socket.php(963): 
Horde_Imap_Client_Socket->_sendCmd(Object(Horde_Imap_Client_Interaction_Command))
#4 /usr/share/php/Horde/Imap/Client/Base.php(867): 
Horde_Imap_Client_Socket->_logout()
#5 /usr/share/php/Horde/Imap/Client/Base.php(329): 
Horde_Imap_Client_Base->logout()
#6 [internal function]: Horde_Imap_Client_Base->shutdown()
#7 {main}
   thrown in 
/usr/share/php/Horde/Imap/Client/Socket/Connection/Socket.php on line 147

2015-10-06 09:23:22: (connections.c.1715) SSL (error): 5 -1 104 
Connection reset by peer
2015-10-06 09:25:33: (connections.c.1715) SSL (error): 5 -1 104 
Connection reset by peer
2015-10-06 09:36:20: (server.c.1558) server stopped by UID = 0 PID = 14177
2015-10-06 09:36:31: (log.c.166) server started
2015-10-06 09:39:52: (connections.c.1715) SSL (error): 5 -1 104 
Connection reset by peer
2015-10-06 09:51:12: (connections.c.1715) SSL (error): 5 -1 104 
Connection reset by peer
2015-10-06 10:06:52: (server.c.1558) server stopped by UID = 0 PID = 5201
2015-10-06 10:07:03: (log.c.166) server started
2015-10-06 10:07:17: (connections.c.1715) SSL (error): 5 -1 104 
Connection reset by peer
2015-10-06 10:07:17: (connections.c.1715) SSL (error): 5 -1 104 
Connection reset by peer
2015-10-06 10:07:19: (connections.c.1715) SSL (error): 5 -1 32 Broken pipe
2015-10-06 10:07:19: (connections.c.1715) SSL (error): 5 -1 32 Broken pipe
2015-10-06 10:12:10: (server.c.1558) server stopped by UID = 0 PID = 3408
2015-10-06 10:12:10: (log.c.166) server started
2015-10-06 10:12:39: (connections.c.1715) SSL (error): 5 -1 104 
Connection reset by peer

When I restart the service lighhttpd  the webinterface is immediatly 
responsive again. But I can not preclude that the problem might be on 
side of my samba & dovecot server as there where updates there, too.

I'm very gratefull for suggestions on where to search for the mistake. 
Kind regards , Jens.