Jira doesn't retry authentication if the LDAP directory is temporarily not functional during authentication

Issue Summary

This is reproducible on Data Center: yes

Steps to Reproduce

1. Configure Jira to connect to Crowd DC and Crowd DC to an AD
2. Set directory sync intervals to a very short period like 10 minutes
3. Keep making basic auth REST API requests to Jira

Expected Results

If the LDAP is "not functional during authentication", Jira should retry the request for a configurable amount of attempts.

Actual Results

Jira fails to authenticate the user and fails with:

[c.a.c.manager.application.ApplicationServiceGeneric] Directory '*****' is not functional during authentication of '*****'. Skipped. 

Workaround

• Check if there are no Proxy rules closing the connection between Jira and Crowd (connection reset)
• Implement retry mechanisms on the client app connecting to Jira
• Increase the directory sync interval to mitigate this occurrence