AWS Client VPN shows "Re-establishing connection" message intermitently

The intermittent "Re-establishing connection" message you're experiencing with AWS Client VPN could be caused by several factors. Since this issue is specific to your region and not experienced by your teammates, it's likely related to network connectivity or firewall settings in your local environment. Here are some steps to troubleshoot the issue:

1. Check your local firewall settings: Ensure that your computer's firewall is not blocking inbound or outbound TCP or UDP traffic on ports 443 or 1194, which are used by AWS Client VPN.

2. Verify network connectivity: The fact that you're unable to telnet to the IP address when the VPN fails to connect suggests there might be network connectivity issues. This could be due to intermittent internet problems or routing issues specific to your location.

3. Contact your Client VPN administrator: Ask them to verify the following:

   • The firewall rules for the Client VPN endpoint are not blocking TCP or UDP traffic on ports 443 or 1194.
   • The configuration file contains the correct client key and certificate.
   • The Client Certificate Revocation List (CRL) is still valid and not expired.

4. Send diagnostic logs to AWS Support:

   • Open the AWS VPN Client app
   • Choose Help, then Send Diagnostic Logs
   • Follow the prompts to send the logs and obtain a reference number
   • Contact AWS Support with this reference number for further assistance

5. Check for DNS issues: Sometimes, DNS resolution problems can cause intermittent connectivity issues. Ensure your DNS settings are correct and try using alternative DNS servers if possible.

6. Test with a different network: If possible, try connecting from a different network (e.g., mobile hotspot) to determine if the issue is specific to your current network.

7. Verify the Client VPN endpoint status: Ask your administrator to check if there are any issues with the Client VPN endpoint in your specific region.

If the problem persists after trying these steps, it would be best to work with your organization's network team and AWS Support to further investigate the issue, as it may be related to specific network configurations or regional connectivity problems.

Sources
Troubleshooting common AWS Client VPN problems - AWS Client VPN
Troubleshooting AWS Client VPN connections - AWS Client VPN
AWS VPN | Features | Amazon Web Services (AWS)