docs: Connect NGINX Agent to NGINX One using an explicit forward proxy

content/includes/installation/add-ports-agent-selinux.md

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 docs:
 files:
-  - content/nginx-one/agent/configure-instance-reporting/configure-selinux.md
+  - content/nginx-one/agent/configure-instances/configure-selinux.md
   - content/nim/system-configuration/configure-selinux.md
   - content/nms/nginx-agent/install-nginx-agent.md
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content/includes/installation/enable-agent-selinux.md

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 docs:
 files:
-   - content/nginx-one/agent/configure-instance-reporting/configure-selinux.md
+   - content/nginx-one/agent/configure-instances/configure-selinux.md
    - content/nim/system-configuration/configure-selinux.md
    - content/nms/nginx-agent/install-nginx-agent.md
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content/nginx-one/agent/configure-instances/_index.md

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+---
+title: "Configure instances"
+weight: 400
+url: /nginx-one/agent/configure-instances/
+---

content/nginx-one/connect-instances/connect-using-squid.md

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+---
+title: Prepare - Set up Squid as a proxy
+toc: true
+weight: 250
+nd-docs: DOCS-000
+---
+
+NGINX Agent can be configured to connect to NGINX One using a [Squid proxy](https://www.squid-cache.org/). This is useful in environments where direct internet access is restricted or monitored.
+
+## Before you start
+
+Ensure you have the following:
+
+- [Squid proxy server set up and running](https://wiki.squid-cache.org/SquidFaq/InstallingSquid)
+- [NGINX Agent is installed]({{< ref "nginx-one/agent/install-upgrade/" >}})
+- Access to the NGINX One console
+
+
+## Configure Squid
+
+Follow the steps below to configure Squid with basic authentication.
+
+1. Open the Squid configuration file with your favorite text editor (you might need superuser privileges):
+
+   ```sh
+   vi /etc/conf/squid.conf
+   ```
+
+1. Add the following lines to configure the proxy settings:
+
+   ```conf
+   # Standard HTTP port for the proxy.
+   http_port myproxy.example.com:3128
+
+   # Define an ACL for allowing access from the agent's IP address
+   acl agent_ip src <AGENT_IP_ADDRESS>
+
+   # Allow the agent to connect to NGINX One Console
+   acl mgmt_server dstdomain agent.connect.nginx.com
+
+   # Allow HTTPS traffic (port 443 is default for HTTPS)
+   acl ssl_ports port 443
+
+   # HTTP access rules (allow the agent to access the destination server through the proxy)
+   http_access allow agent_ip mgmt_server ssl_ports
+
+   # Deny all other traffic by default (best practice)
+   http_access deny all
+   ```
+
+
+1. Save the changes and exit the text editor.
+1. Restart the Squid service to apply the changes:
+
+   ```sh
+   sudo systemctl reload squid
+   ```
+
+---
+
+## NGINX Agent Proxy configuration
+
+1. Open a secure connection to your instance using SSH and log in.
+1. Open the NGINX Agent configuration file (/etc/nginx-agent/nginx-agent.conf) with a text editor. To edit this file you need superuser privileges.
+1. Add or modify the `proxy` section to include the Squid proxy URL and timeout settings:
+
+   ```conf
+   server:
+      host: agent.connect.nginx.com
+      port: 443
+      proxy:
+         url: "http://proxy.example.com:3128"
+   ```
+
+1. Reload NGINX Agent to apply the changes:
+
+    ```sh
+    sudo systemctl restart nginx-agent
+    ```
+
+### In a containerized environment
+
+To configure NGINX Agent in a containerized environment:
+
+1. Run the NGINX Agent container with the environment variables set as follows:
+
+   ```sh
+   sudo docker run \
+      --add-host "myproxy.example.com:host-gateway" \
+      --env=NGINX_AGENT_COMMAND_SERVER_PORT=443 \
+      --env=NGINX_AGENT_COMMAND_SERVER_HOST=agent.connect.nginx.com \
+      --env=NGINX_AGENT_COMMAND_AUTH_TOKEN="<your-data-plane-key-here>" \
+      --env=NGINX_AGENT_COMMAND_TLS_SKIP_VERIFY=false \
+      --env=NGINX_AGENT_COMMAND_SERVER_PROXY_URL=http://myproxy.example.com:3128 \
+      --restart=always \
+      --runtime=runc \
+      -d private-registry.nginx.com/nginx-plus/agentv3:latest
+   ```
+
+
+## NGINX Agent proxy authentication
+
+If your Squid proxy requires authentication, you can specify the username and password in the `proxy` section of the `agent.conf` file:
+
+1. Open a secure connection to your instance using SSH and log in.
+1. Add or modify the `proxy` section of the NGINX Agent configuration file (/etc/nginx-agent/nginx-agent.conf) to include the authentication details:
+
+   ```conf
+   proxy:
+      url: "http://proxy.example.com:3128"
+      auth_method: "basic"
+      username: "user"
+      password: "pass"
+   ```
+
+1. Reload NGINX Agent to apply the changes:
+
+    ```sh
+    sudo systemctl restart nginx-agent
+    ```
+
+### In a containerized environment
+
+To set proxy authentication in a containerized environment:
+
+1. Run the NGINX Agent container with the environment variables set as follows:
+
+
+   ```sh
+   sudo docker run \
+      --add-host "myproxy.example.com:host-gateway" \
+      --env=NGINX_AGENT_COMMAND_SERVER_PORT=443 \
+      --env=NGINX_AGENT_COMMAND_SERVER_HOST=agent.connect.nginx.com \
+      --env=NGINX_AGENT_COMMAND_AUTH_TOKEN="<your-data-plane-key-here>" \
+      --env=NGINX_AGENT_COMMAND_TLS_SKIP_VERIFY=false \
+      --env NGINX_AGENT_COMMAND_SERVER_PROXY_URL=http://proxy.example.com:3128
+      --env NGINX_AGENT_COMMAND_SERVER_PROXY_AUTH_METHOD=basic
+      --env NGINX_AGENT_COMMAND_SERVER_PROXY_USERNAME="user"
+      --env NGINX_AGENT_COMMAND_SERVER_PROXY_PASSWORD="pass"
+      --restart=always \
+      --runtime=runc \
+      -d private-registry.nginx.com/nginx-plus/agentv3:latest
+   ```
+
+## Validate connectivity between NGINX Agent, Squid, and NGINX One Console
+
+To test the connectivity between NGINX Agent, Squid, and NGINX One Console, you can use the `curl` command with the proxy settings.
+
+1. Open a secure connection to your instance using SSH and log in.
+1. Run the following `curl` command to test the connection:
+   ```sh
+   curl -x http://proxy.example.com:3128 -U your_user:your_password https://agent.connect.nginx.com/api/v1/agents
+   ```
+
+   - Replace `proxy.example.com:3128` with your Squid proxy address and port.
+   - Replace `your_user` and `your_password` with the credentials you set up for Squid in the previous steps.
+
+To test the configuration from a containerized environment, run the following command from within the container:
+
+   ```sh
+   curl -x http://host.docker.internal:3128 -U your_user:your_password https://agent.connect.nginx.com/api/v1/agents
+   ```
+
+   - Replace `your_user` and `your_password` with the credentials you set up for Squid in the previous steps.
+
+## Troubleshooting
+
+1. Find the configuration and log files:
+
+   - Run `squid -v | grep "configure options"`
+   - Configuration directory should look like `--sysconfdir=/etc/squid'`
+   - Log directory should look like `--sysconfdir=/var/log'`
+