When a VPN gateway subscription expires, the specific retention period and renewal method may vary depending on the service provider. Generally speaking, some service providers may allow you to keep the VPN gateway in a certain number of days after the subscription expires, during which you can still use some basic functions, but advanced features may be restricted.
For example, some cloud service providers may allow you to keep the VPN gateway for 30 days after the subscription expires. During this period, you can choose to renew the subscription to restore full functionality.
Regarding the renewal method, it usually involves logging into the cloud service provider's console, navigating to the VPN gateway management page, and selecting the renewal option. You may need to follow the on-screen instructions to complete the renewal process, which usually includes selecting the subscription period, payment method, etc.
If you are using cloud services from Tencent Cloud, you can log in to the Tencent Cloud console, go to the VPN gateway management page, and select "Renewal" in the operation column of the VPN gateway instance list to renew the subscription. Tencent Cloud provides flexible subscription periods and multiple payment methods to meet your needs.
Please note that the specific retention period and renewal method may vary depending on the cloud service provider and the specific plan you are using. It is recommended to consult the relevant documentation or contact the cloud service provider's customer service for more detailed information.