Unable to Establish Connection to Private Apps

Verify Whether Node Services Are Running

Launch a terminal and run this command: sudo service node-server status

These status messages are displayed based on your OS version:


Operating system	Status (Displayed output)	Description
Ubuntu	`Active: active (running)`	Indicates that the node server service is running.
Ubuntu	`inactive (dead)`	Indicates that the node server service is not running.
RHEL	`Running`	Indicates that the node server service is running.
RHEL	`Not running (process not found)`	Indicates that the node server service is not running.

If the service is not running, run this command to start the node service:

sudo service node-server start

Verify Whether Tunnel Is Established

In the Management Console, select Administration > Node Management.
Verify that the ZTNA TUNNEL column displays a status of Connected.
Sign in to the node where you installed the connector.
Run this command to display details about the ZTNA tunnel and verify whether the service is running:
```
sudo swanctl -l
```
If the tunnel is successful, the connection displays a status of ESTABLISHED. If not, the connection displays a status of Connecting.
If the tunnel is not established, the local firewall might be blocking the required outbound ports.
Run these commands in a terminal session to open the required ports on Ubuntu:
```
sudo ufw allow out 500/udp sudo ufw allow out 4500/udp sudo ufw allow out 443/tcp sudo ufw status
```
Restart the services to test the new settings with these commands:
```
sudo service node-server start sudo service node-server stop
```

Check the status of the service with this command:

sudo service node-server status

These status messages are displayed based on your OS version:


Operating system	Status (Displayed output)	Description
Ubuntu	`Active: active (running)`	Indicates that the node server service is running.
Ubuntu	`Active: inactive (dead)`	Indicates that the node server service is not running.
RHEL	`Running`	Indicates that the node server service is running.
RHEL	`Not running (process not found)`	Indicates that the node server service is not running.

Run this command from the terminal and verify the connection:

sudo swanctl -l

If the tunnel is established, the connection displays a status of ESTABLISHED.

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