Hy!
I recently have noticed an error when users try to log in to SOGo webmail. Here is what I can see in the /var/log/soog/soog.log file:
Jul 29 9:16:40 sogod[27309]: [ERROR] <0x0x7f4d2525d878[NGLdapAttribute]> could not convert value of objectSid to string
Jul 29 9:16:40 sogod[27309]: [ERROR] <0x0x7f4d25360e08[NGLdapAttribute]> could not convert value of objectGUIDto string
192.168.1."xxx", 127.0.0.1 - - [29/Jul2014:09:16:40 GMT] "GET /SOGo/ HTTP/1.1" 302 0/0 0.040 - - 0
127.0.0.1 - - [29/Jul2014:09:16:40 GMT] "GET /SOGo/imre.bertalan HTTP/1.1" 302 0/0 0.003 - - 0
127.0.0.1 - - [29/Jul2014:09:16:40 GMT] "GET /SOGo/imre.bertalan/view HTTP/1.1" 302 0/0 0.003 - - 0
Additional info: A colleague of my modified the access of SOGo webinterface to make it accessable only with "https". Could that make tha problem?