IIS Configuration

1. Install Required Components

• Install Application Request Routing (ARR) via IIS Manager or Web Platform Installer.

2. ARR Settings

• Navigate to: IIS Manager > Server Level > Application Request Routing Cache > Server Proxy Settings

  • Enable Proxy: Checked

  • Reverse rewrite host in response headers: Checked

3. Request Filtering

• Navigate to: Default Web Site > Request Filtering > Edit Feature Settings

  • Allow Double Escaping: Checked

4. URL Rewrite Rule

• Navigate to: Default Web Site > URL Rewrite > Add Rules > Blank Rule

  • Name: Jenkins Rewrite

  • Match URL: Using Regular Expressions

    • Pattern: (.*)

  • Conditions:

    • {HTTP_HOST} matches .*jenkins.mydomain.com.*

  • Action:

    • Action Type: Rewrite

    • Rewrite URL: http://localhost:8080{UNENCODED_URL}

    • Append Query String: Checked

5. Configuration Editor

• Navigate to: Default Web Site > Configuration Editor > system.webServer/rewrite/rules

  • Set useOriginalURLEncoding to False

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Jenkins Configuration

1. System Configuration

• Navigate to: Manage Jenkins > Configure System

  • Jenkins URL: https://jenkins.mydomain.com/

2. Security Settings

• Navigate to: Manage Jenkins > Configure Global Security

  • Enable Proxy Compatibility: Checked

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Notes

• Do not modify the hosts file to map jenkins.mydomain.com to 127.0.0.1.

• No need to configure SSL in IIS since SSL termination is handled by the ALB.

• Ignore Jenkins reverse proxy warning once everything is working correctly.

ref: https://stackoverflow.com/a/63146495/9082863