Redmine

Sometimes users see an 'internal error' page when trying to log in with their LDAP credentials. I noticed, that this correlates with some problems with the DNS server in our network - sometimes the name of the LDAP server can not be resolved, and if one tries to log in to redmine during these periods, they see the error. Problem is gone immediately after dns is up again.

We are using LDAPS, with "users on-the-fly creation" enabled. LDAP users that fail to log in are not new ones - they already exist in the system.

Environment:
  Redmine version                3.2.2.stable
  Ruby version                   2.0.0-p384 (2014-01-12) [x86_64-linux-gnu]
  Rails version                  4.2.5.2
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.8.8
  Git                            1.9.1
  Filesystem                     
Redmine plugins:
  advanced_roadmap_v2            2.4.2