JIRA returns "400 - bad request"

Make sure you use HTTPS url for your Jira installation, Jira does not allow "basic authentication" for non-SSL connections by default. Also, make sure you do not have any mandatory/required custom fields in JIRA (make them non-required). Refer to JIRA's log to find the specific issue.

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Jitbit Helpdesk ticketing system is our flagship product. Its a great helpdesk software app offered both as a hosted and "on-premise" versions.