High load on the system 

1. Monitoring data of the affected servers (graphs) - at least day and week
2. Oxsysreport with thread dumps
3. High memory use: Heap + thread dump

Communication link error

1. Check the network and the server mentioned at the beginning of the stack trace
2. Dovecot:  add Dovecot logs
3. Database:  see next column

Database issues

1. Include general oxsysreport
2. DB slow logs from the time the issue first occurred
3. Show global status
4. Show processlist (show engine innodb status/G)
5. Monitoring data of the affected servers (graphs) - at least day and week

login issues 

1. Exact date and time
2. Apache logs from the time frame
3. General oxsysreport

auth issue 

1. OX 
   general information and oxsysreport
   
   
2. Dovecot 
   OX Login is working but not Dovecot

• • Check OX logs, in case of error regarding password change
  • Dovecot logs in verbose mode

UI issue: 

1. Test account to reproduce the issue