Gitlab Jira Integration Failed Authentication

Hi There,

i am using the gitlab jira integration. Most of the time it works fine. But sometimes there happens something wrong with the login (i guess) and jira requires captcha for my gitlab user. Any ideas why?

Here is are log snippets of jira:

Most of the time:
2017-12-22 10:01:53,900 https-jsse-nio-8443-exec-63 gitlab 601x1459622x1 - [IP] /rest/api/2/issue/[ID]/remotelink The user ‘git’ has PASSED authentication.

And then sometimes 3 times:
2017-12-22 10:37:43,674 https-jsse-nio-8443-exec-44 anonymous 637x1460307x1 - [IP] /rest/api/2/issue/[TASK-ID] login : ‘git’ tried to login but they do not have USE permission or weren’t found. Deleting remember me cookie.
2017-12-22 10:37:43,681 https-jsse-nio-8443-exec-44 anonymous 637x1460307x1 - [IP] /rest/api/2/issue/[TASK-ID] The user ‘git’ has FAILED authentication. Failure count equals 1

And finally:
2017-12-22 10:43:00,814 https-jsse-nio-8443-exec-69 anonymous 643x1460690x1 - [IP] /rest/api/2/issue/[TASK-ID] The user ‘git’ is required to answer a CAPTCHA elevated security check. Failure count equals

After the last log message git cannot log in anymore until i reset the count for that user manually.

Is this issue jira or gitlab related?