Cant login

[krooarbo]

Describe the bug
I cant login.

Thruk Version
Version of Thruk (and OMD if applicable)

thruk 3.26+1
Installed from https://labs.consol.de/repo/stable/

To Reproduce
Steps to reproduce the behavior:

1. Go to 'http://$host/thruk/cgi-bin/login.cgi.'
2. Click on 'Sign in'
3. Scroll down to '....'
4. See error

Following error on the web UI:

"technical problem during login, please have a look at the logfiles."

Thruk debug log:

[2026/03/24 07:59:47][][DEBUG] file logging initialized with loglevel 4
[2026/03/24 07:59:47][][DEBUG] reading /etc/thruk/cgi.cfg
[2026/03/24 07:59:47][][DEBUG] reading config file: /etc/thruk/cgi.cfg
[2026/03/24 07:59:47][][DEBUG] server timezone: Europe/Vienna (from /etc/timezone)
[2026/03/24 07:59:47][][DEBUG] _dispatcher: http://10.9.0.17/thruk/cgi-bin/login.cgi?nocookie&thruk/
[2026/03/24 07:59:47][][DEBUG] params: {'nocookie' => '','thruk/' => ''}
[2026/03/24 07:59:47][][DEBUG] cgi-bin/login.cgi.cgi does not require authentication
[2026/03/24 07:59:47][][INFO] [07:59:47.743] pid: 1878351 req: 001 mem: 45.59 MB 4.17 MB dur: 0.025s (-/V:0.012s) size: 23.425 kb stat: 401 url: login.cgi?nocookie&thruk/
[2026/03/24 07:59:47][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:47][][DEBUG] | total time | 0.02906s |
[2026/03/24 07:59:47][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:47][][DEBUG] | _dispatcher: http://10.9.0.17/thruk/cgi-bin/login.cgi?nocookie&thruk/ | 0.02447s |
[2026/03/24 07:59:47][][DEBUG] | time: Tue Mar 24 07:59:47 2026 - host: - pid: 1878351 - req: | |
[2026/03/24 07:59:47][][DEBUG] | Root begin | 0.00060s |
[2026/03/24 07:59:47][][DEBUG] | Thruk::Controller::login::index | 0.00033s |
[2026/03/24 07:59:47][][DEBUG] | login::index | 0.00030s |
[2026/03/24 07:59:47][][DEBUG] | Root end | 0.00006s |
[2026/03/24 07:59:47][][DEBUG] | render_tt: login.tt | 0.01242s |
[2026/03/24 07:59:47][][DEBUG] | render: login.tt | 0.00742s |
[2026/03/24 07:59:47][][DEBUG] | render post: login.tt | 0.00008s |
[2026/03/24 07:59:47][][DEBUG] | finalize_request | 0.00002s |
[2026/03/24 07:59:47][][DEBUG] | render: _internal_stats.tt | 0.00450s |
[2026/03/24 07:59:47][][DEBUG] | render post: _internal_stats.tt | 0.00007s |
[2026/03/24 07:59:47][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:47][][DEBUG] | total time waited on rendering | 0.01242s |
[2026/03/24 07:59:47][][DEBUG] | total time | 0.02906s |
[2026/03/24 07:59:47][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:47][][DEBUG] checking memory limit: 45.59 (limit: 1000)
[2026/03/24 07:59:48][][DEBUG] _dispatcher: http://10.9.0.17/thruk/cgi-bin/login.cgi?nocookie&thruk/
[2026/03/24 07:59:48][][DEBUG] params: {'nocookie' => '','thruk/' => ''}
[2026/03/24 07:59:48][][DEBUG] cgi-bin/login.cgi.cgi does not require authentication
[2026/03/24 07:59:48][][INFO] [07:59:48.006] pid: 1878351 req: 002 mem: 45.66 MB 0.07 MB dur: 0.004s (-/V:0.001s) size: 23.427 kb stat: 401 url: login.cgi?nocookie&thruk/
[2026/03/24 07:59:48][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:48][][DEBUG] | total time | 0.00427s |
[2026/03/24 07:59:48][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:48][][DEBUG] | _dispatcher: http://10.9.0.17/thruk/cgi-bin/login.cgi?nocookie&thruk/ | 0.00365s |
[2026/03/24 07:59:48][][DEBUG] | time: Tue Mar 24 07:59:48 2026 - host: - pid: 1878351 - req: | |
[2026/03/24 07:59:48][][DEBUG] | Root begin | 0.00080s |
[2026/03/24 07:59:48][][DEBUG] | Thruk::Controller::login::index | 0.00036s |
[2026/03/24 07:59:48][][DEBUG] | login::index | 0.00032s |
[2026/03/24 07:59:48][][DEBUG] | Root end | 0.00006s |
[2026/03/24 07:59:48][][DEBUG] | render_tt: login.tt | 0.00144s |
[2026/03/24 07:59:48][][DEBUG] | render: login.tt | 0.00136s |
[2026/03/24 07:59:48][][DEBUG] | render post: login.tt | 0.00005s |
[2026/03/24 07:59:48][][DEBUG] | finalize_request | 0.00002s |
[2026/03/24 07:59:48][][DEBUG] | render: _internal_stats.tt | 0.00053s |
[2026/03/24 07:59:48][][DEBUG] | render post: _internal_stats.tt | 0.00007s |
[2026/03/24 07:59:48][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:48][][DEBUG] | total time waited on rendering | 0.00145s |
[2026/03/24 07:59:48][][DEBUG] | total time | 0.00427s |
[2026/03/24 07:59:48][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:48][][DEBUG] checking memory limit: 45.66 (limit: 1000)
[2026/03/24 07:59:53][][DEBUG] _dispatcher: http://10.9.0.17/thruk/cgi-bin/login.cgi
[2026/03/24 07:59:53][][DEBUG] params: {'login' => 'thrukadmin','password' => '...','referer' => 'thruk/'}
[2026/03/24 07:59:53][][DEBUG] cgi-bin/login.cgi.cgi does not require authentication
[2026/03/24 07:59:53][][DEBUG] using SSL_ca_file: /usr/lib/thruk/perl5/Mozilla/CA/cacert.pem (from Mozilla::CA::SSL_ca_file)
[2026/03/24 07:59:53][][INFO] [07:59:53.454] pid: 1878351 req: 003 mem: 47.64 MB 1.98 MB dur: 0.020s (-/-) size: 0.064 kb stat: 302 url: login.cgi
[2026/03/24 07:59:53][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:53][][DEBUG] | total time | 0.01956s |
[2026/03/24 07:59:53][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:53][][DEBUG] | _dispatcher: http://10.9.0.17/thruk/cgi-bin/login.cgi | 0.01953s |
[2026/03/24 07:59:53][][DEBUG] | time: Tue Mar 24 07:59:53 2026 - host: - pid: 1878351 - req: | |
[2026/03/24 07:59:53][][DEBUG] | Root begin | 0.00059s |
[2026/03/24 07:59:53][][DEBUG] | Thruk::Controller::login::index | 0.01802s |
[2026/03/24 07:59:53][][DEBUG] | login::index | ~0.01801s |
[2026/03/24 07:59:53][][DEBUG] | get_user_data | 0.00002s |
[2026/03/24 07:59:53][][DEBUG] | login::external_authentication | 0.01763s |
[2026/03/24 07:59:53][][DEBUG] | ext::auth: post1 http://localhost/thruk/cgi-bin/restricted.cgi | 0.00680s |
[2026/03/24 07:59:53][][DEBUG] | Root end | 0.00008s |
[2026/03/24 07:59:53][][DEBUG] | finalize_request | 0.00003s |
[2026/03/24 07:59:53][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:53][][DEBUG] | total time waited on io | 0.00005s |
[2026/03/24 07:59:53][][DEBUG] | total time | 0.01956s |
[2026/03/24 07:59:53][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:53][][DEBUG] checking memory limit: 47.64 (limit: 1000)
[2026/03/24 07:59:53][][DEBUG] _dispatcher: http://10.9.0.17/thruk/cgi-bin/login.cgi?problem&thruk/
[2026/03/24 07:59:53][][DEBUG] params: {'problem' => '','thruk/' => ''}
[2026/03/24 07:59:53][][DEBUG] cgi-bin/login.cgi.cgi does not require authentication
[2026/03/24 07:59:53][][DEBUG] set_message: fail_message - technical problem during login, please have a look at the logfiles.
[2026/03/24 07:59:53][][INFO] [07:59:53.557] pid: 1878351 req: 004 mem: 47.77 MB 0.12 MB dur: 0.004s (-/V:0.002s) size: 23.574 kb stat: 401 url: login.cgi?problem&thruk/
[2026/03/24 07:59:53][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:53][][DEBUG] | total time | 0.00381s |
[2026/03/24 07:59:53][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:53][][DEBUG] | _dispatcher: http://10.9.0.17/thruk/cgi-bin/login.cgi?problem&thruk/ | 0.00327s |
[2026/03/24 07:59:53][][DEBUG] | time: Tue Mar 24 07:59:53 2026 - host: - pid: 1878351 - req: | |
[2026/03/24 07:59:53][][DEBUG] | Root begin | 0.00055s |
[2026/03/24 07:59:53][][DEBUG] | Thruk::Controller::login::index | 0.00038s |
[2026/03/24 07:59:53][][DEBUG] | login::index | 0.00034s |
[2026/03/24 07:59:53][][DEBUG] | Root end | 0.00006s |
[2026/03/24 07:59:53][][DEBUG] | render_tt: login.tt | 0.00154s |
[2026/03/24 07:59:53][][DEBUG] | render: login.tt | 0.00147s |
[2026/03/24 07:59:53][][DEBUG] | render post: login.tt | 0.00005s |
[2026/03/24 07:59:53][][DEBUG] | finalize_request | 0.00002s |
[2026/03/24 07:59:53][][DEBUG] | render: _internal_stats.tt | 0.00045s |
[2026/03/24 07:59:53][][DEBUG] | render post: _internal_stats.tt | 0.00007s |
[2026/03/24 07:59:53][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:53][][DEBUG] | total time waited on rendering | 0.00155s |
[2026/03/24 07:59:53][][DEBUG] | total time | 0.00381s |
[2026/03/24 07:59:53][][DEBUG] +----------------------------------------------------------------------------------+-------------+
[2026/03/24 07:59:53][][DEBUG] checking memory limit: 47.77 (limit: 1000)

Expected behavior
Login success

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):
Any browser . E.g. Google Chrome 146.0.7680.154, Firefox 148.0.2 (64 bites), Microsoft Edge 146.0.3856.72

Additional context