What should I do if the SSL certificate expires? Quick Renewal and Repair Methods

in the current popularity of HTTPS, SSL certificate is the core guarantee of website security access. Once expired, it will not only trigger the security warning of the browser, resulting in user churn, but also may cause data transmission risks and affect the search engine ranking of the website. Many operation and maintenance personnel often ignore the valid period management of certificates, and wait until the problem breaks out to deal with it hastily, but it is easy to cause more failures. This article will provide you with a complete set of SSL certificate expiration solutions from four dimensions: expiration warning troubleshooting, fast renewal process, emergency repair method and long-term protection, to help you solve problems efficiently and reduce security risks.

How to check the SSL certificate expiration warning?

check the SSL certificate expiration warning in advance, is the key to avoid sudden failure, through active monitoring can reserve sufficient preparation time for renewal.

1, manually check the certificate valid period

can be viewed directly through the browser, after opening the target website click the lock icon in the address bar, select the certificate option in turn to view the effective time and expiration time of the SSL certificate; you can also query through the server command line, such as using the openssl command in the Linux system, enter the corresponding domain name to quickly obtain the valid period information of the certificate, suitable for the operation and maintenance personnel who manage multiple websites in batches.

2, set up automatic warning reminder

with the help of professional monitoring tools to achieve automated early warning, such as the SSL certificate monitoring function provided by Cloud as a Service vendors, or third-party operation and maintenance platforms, you can set reminders of multiple nodes such as 30 days, 15 days, 7 days in advance, and send notifications through emails, SMS, WeCom and other channels to ensure that operation and maintenance personnel receive early warning information in time to avoid missing the renewal time.

How to quickly renew an SSL certificate after it expires?

SSL certificate expires, quickly complete the renewal is the core step to restore normal access to the website, different types of certificate renewal process is slightly different, but the overall logic is consistent.

1, confirm the type of certificate and submit the application

first to confirm the type of the original SSL certificate, including DV domain name type, OV enterprise type, EV enhanced type, different types of certificate renewal requirements are different. DV certificate renewal only needs to verify the ownership of the domain name, usually within 10 minutes to complete; OV and EV certificates need to re-verify the enterprise identity information, the process is relatively complicated, may take 1-3 working days, it is recommended to prepare business licenses, organization code certificates and other related materials in advance to improve moderation efficiency.

2, download and deploy a new SSL certificate

is approved, download the new SSL certificate file from the certificate authority or Cloud as a Service platform, including the certificate body file, private key file and intermediate certificate. Then deploy according to the server type. For example, the Nginx server needs to modify the configuration file, specify the storage path of the new certificate, and take effect after restarting the service. The Apache server needs to update the certificate path in the htpd.conf or ssl.conf file, and also needs to restart the service to complete the deployment.

3. Emergency repair method after SSL certificate expires?

if the SSL certificate has expired and the renewal process has not been completed, emergency repair measures need to be taken to temporarily restore website access and reduce the impact on the business.

1, temporary deployment of free SSL certificate

can apply for a free SSL certificate provided by Let's Encrypt and other institutions. The application process of this type of certificate is simple, and it can be obtained within a few minutes after verifying the ownership of the domain name. It is suitable for temporary transitional use. It should be noted that the valid period of the free certificate is usually 90 days, and it needs to be replaced with a formal paid SSL certificate in time to avoid the problem of expiration again.

2, Temporary downgrade to HTTP access (not recommended)

in case of extreme emergency, you can temporarily downgrade the website from HTTPS to HTTP access, but this method will completely lose the security protection of the SSL certificate, there is a risk of theft and tampering during data transmission, which is only suitable for short-term emergency, and it is necessary to modify the resource links inside the website synchronously to avoid mixed content warnings, and restore HTTPS access immediately after the deployment of the new SSL certificate is completed.

4. How to avoid the SSL certificate expiring again?

solve the current SSL certificate expiration problem, it is also necessary to establish a long-term management mechanism to avoid similar problems from happening again.

1 Enable SSL certificate auto-renewal

at present, most Cloud as a Service vendors and certificate authorities support the automatic renewal function of SSL certificates. After opening, the system will automatically complete the renewal review and deployment before the certificate expires, without manual intervention. For example, the SSL certificate services of platforms such as Alibaba Cloud and Tencent Cloud can automate the whole process by simply turning on the automatic renewal switch in the console, which greatly reduces the operation and maintenance cost.

2, establish a certificate life cycle management ledger

For the operation and maintenance team that manages multiple websites, it is recommended to establish an SSL certificate life cycle management ledger, record the domain name, type, effective time, expiration time, authority, deployment server and other information of each certificate, and regularly check and update. At the same time, the certificate renewal work is included in the monthly or quarterly operation and maintenance plan, and a special person is arranged to follow up to ensure that the valid period of all SSL certificates is within the controllable range.

To sum up, the core of SSL certificate expiration is "prevention first, rapid response, long-term management". Through early investigation and early warning, standardized renewal process, emergency repair measures, and automated management and ledger records, it can effectively avoid the security risks and business losses caused by certificate expiration. Operation and maintenance personnel need to pay attention to the life cycle management of SSL certificates, which is an important part of daily operation and maintenance work, to ensure the safety and stability of the website, and to maintain user trust and brand perception.