Redmine

I am relatively new to redmine and I am not sure where to look for information regarding my current issue. I hope someone can help me solve my issue or point me where I can read about it.

I have copied application and db from server and I want to run it on localhost, for debugging and testing. Almost everything works perfectly, the only issue is authentication - it redirects me to outside of my localhost, where I can enter my credentials and then redirects me to the url of app run on server.

I searched app' folder for "auth" and seems like it is using open id, as it is only plugin listed. However we use Universal ID in order to log in, so it may be some outside application I am being redirected to.

How can I remove authentication or move it to localhost? Or where can I look for informations regarding this problem?

Environment:
Redmine version 3.3.1.stable
Ruby version 2.2.9-p480 (2017-12-15) [x86_64-linux]
Rails version 4.2.7.1
Environment development
Database adapter Mysql2
SCM:
Filesystem
Redmine plugins:
_query 0.0.2
event_notifications 3.2.1
issue_charts 1.3.0
redmine_base_deface 0.0.1
redmine_blocks_layout 0.0.2
redmine_changeauthor 1.0.1
redmine_custom_css 0.1.6
redmine_custom_workflows 0.1.6
redmine_document_move 0.1.0
redmine_documents_short 0.4.0
redmine_drawio 0.6.0
redmine_embedded_video 0.0.3.1
redmine_favorite_projects 2.0.3
redmine_gemavatar 1.1
redmine_impersonate 0.10.0
redmine_ldap_sync 2.0.8.devel
redmine_lightbox2 0.3.1
redmine_maintenance_mode 2.0.1
redmine_my_page 0.1.10
redmine_omniauth_saml 0.0.1
redmine_pivot_table 0.0.4
redmine_subtask_list_accordion 1.3.2
redmine_tweaks 0.5.9-dev
redmine_wiki_notes 0.0.2
redmine_xlsx_format_issue_exporter 0.1.3
ucms 0.0.1
ucms_gate 0.0.4
ucms_goal 0.0.21
view_customize 1.1.4