### Steps to reproduce

1. Have a Jira DC installed on a [private IP address](https://en.wikipedia.org/wiki/Private_network) like 10.1.2.3 or 192.168.17.4, and have a dns name pointing to that IP address

2. Go to the Jira migrator and add a configuration

3. Add the url and token

4. Click "Test configuration"


### What is the buggy behavior?

* Due to ssrf protection, the access to the ip is blocked and the following error is displayed: "Connection error: Failed to connect to Jira server: Hostname 'xxx.com' has no public ip addresses"


### What is the expected behavior?

1. Begin of the insertionItEnd of the insertion Begin of the deletion It's fine to have an error message, but it should be actionable and/or helpful or we'll have support requests. OpenProject can detect that the IP is private and will be blocked, and explain that the IP address should be added to `OPENPROJECT_SSRF_PROTECTION_IP_ALLOWLIST`.

1. Please see `modules/webhooks/app/services/webhooks/outgoing/request_webhook_service.rb` : it catches `SsrfFilter::PrivateIPAddress` andEnd of the deletion displays a specific error message: Begin of the insertion`Connection blocked:End of the insertion Begin of the deletion "<error message> - If this is intentional, addEnd of the deletion the Begin of the insertionJira host resolvesEnd of the insertion Begin of the deletion IPEnd of the deletion to Begin of the insertiona private IP address. If your Jira instance runs on an internal network, allow its IPEnd of the insertion Begin of the deletion the allowlistEnd of the deletion via the Begin of the insertionOPENPROJECT_SSRF__PROTECTION__IP__ALLOWLISTEnd of the insertion Begin of the deletion OPENPROJECT\_SSRF\_PROTECTION\_IP\_ALLOWLISTEnd of the deletion environment Begin of the insertionvariable. Please see our`[`documentation.`](https://www.openproject.org/docs/installation-and-operations/configuration/ssrf-protection/?go_to_locale=en)

2. Documentation for SSRF protection exists and is **linked** in the test connection functionality and the Jira migrator documentation


End of the insertion Begin of the deletion variable."


End of the deletion ### Screenshots and other files

<img class="image_resized op-uc-image op-uc-image_inline" style="width:491px;" src="/api/v3/attachments/921139/content">

### Environment information

**OpenProject installation type**

* Docker-compose installation


**OpenProject version**

17.4.0