One of the most frustrating moments when setting up a website and deploying HTTPS is clicking "Apply for Certificate" with high expectations, only to be met with a recurring red error message: "Issuance Failed" or "Verification Timed Out."
The root cause of a failure to issue an SSL certificate is that the Certificate Authority (CA) cannot verify your ownership of the domain. If the verification process stalls, the certificate will not be issued, and your website will be unable to display the "green padlock" security indicator. For users hosting websites on overseas cloud servers (such as those provided by Jtti), this issue typically stems from a few specific areas. This article outlines the seven most common causes—from the perspective of server-side and network configuration—and provides a troubleshooting guide.
1. Ports Not Opened in Cloud Security Groups or Server Firewalls
This is the most common and fundamental issue. If you have chosen the file-based verification method (HTTP-01), the CA’s verification nodes must be able to access port 80 of your server from the public internet to retrieve a specific verification file.
If port 80 is not explicitly opened in your cloud platform’s security group (or within the server’s internal firewall, such as UFW or iptables), the verification request will be blocked, resulting in a timeout.
Troubleshooting: Log in to your Jtti console, check your security group rules to ensure that TCP port 80 is open for inbound traffic, and verify the status of the firewall within your server’s operating system.
2. A "Deadlock" Caused by Forced HTTP-to-HTTPS Redirection
This is a detail that is easily overlooked. Many website administrators configure a 301 redirect—forcing all HTTP traffic to HTTPS—within their web server (Nginx/Apache) or website management panel (such as Baota/BT Panel) before the certificate has even been issued.
When the CA’s verification node attempts to access the verification file via `http://yourdomain.com/.well-known/...`, it is immediately redirected to `https://`. However, since the certificate has not yet been issued, an HTTPS connection cannot be established, causing the verification to fail.
Troubleshooting: Temporarily disable the forced HTTP-to-HTTPS redirection in your web server or management panel while applying for the certificate. Once the certificate has been successfully issued and deployed, you can re-enable the redirection. Domain Name Resolution Not Yet Effective or Pointing Incorrectly
The Certificate Authority (CA) needs to access your domain from the public internet. If you have recently modified your DNS records or pointed your domain to the wrong server IP, the CA’s validation request will fail to reach its destination.
Troubleshooting: Run `ping [your-domain]` or use `nslookup` from your local computer to verify that the returned IP address matches the public IP of your Jtti server. If you have just updated your DNS records, please wait 10–30 minutes for DNS caches across the internet to refresh before attempting to request the certificate again.
CAA Record Blocking the Certificate Authority
A CAA (Certification Authority Authorization) record is a security feature in DNS. If your domain has a CAA record that explicitly restricts certificate issuance to a specific CA, and you are currently attempting to obtain a certificate from a different provider, the CA will decline the request.
Troubleshooting: Use an online DNS lookup tool to check your domain’s CAA records. If there is a conflict, update your DNS configuration to include or modify the CAA record to authorize the CA you are currently using.
Security Interference from CDN, DDoS Protection, or WAF
If you have a CDN, a DDoS-protected IP, or a Web Application Firewall (WAF) in front of your server, these proxy layers may block validation requests originating from the CA’s nodes (often located abroad). Certain security policies may automatically block frequent requests from unknown IPs or restrict access to the `.well-known` directory.
Troubleshooting: When requesting a certificate, try pointing your domain directly to your origin server’s IP (bypassing the CDN). Alternatively, check your WAF rules and whitelist the paths `.well-known/acme-challenge/` or `pki-validation`.
Unstable Network Connectivity (Packet Loss Causing Validation Timeouts)
For users hosting websites on overseas VPS instances, poor network quality can lead to certificate issuance failures. Since CA validation nodes are typically located abroad, significant packet loss—especially during peak evening hours—or inefficient cross-border routing can cause validation requests to time out before they reach your server.
This is where Jtti Cloud Servers provide a robust foundation: our Hong Kong and U.S. nodes utilize premium CN2 GIA network routes, offering optimized, direct connectivity across major carriers. This type of network connection not only ensures fast access for users but also maintains an extremely low packet loss rate for machine-to-machine interactions, such as certificate validation. Stable network connectivity allows overseas Certificate Authority (CA) nodes to retrieve validation files quickly and reliably, significantly reducing "false failures" caused by network instability.
Exceeding the Application Frequency Limit for a Domain
To prevent abuse, free CA providers like Let's Encrypt impose strict limits on the frequency of certificate issuance for any single domain (e.g., a maximum of 5 times per week). Repeated failed attempts followed by immediate retries can easily trigger these rate limits.
Troubleshooting: If your console displays the error "too many certificates already issued," you must wait between 1 and 7 days before attempting to apply again. During this period, it is recommended to resolve any underlying configuration issues.
Significant Discrepancy in Server System Time
SSL certificate validation and validity period calculations rely on timestamps. If your server's system time deviates significantly from the standard time (for instance, if it is off by several hours or days), the CA's validation mechanism will fail.
Troubleshooting: Log in to your server and run the `date` command to verify that the system time is accurate. If there is a significant discrepancy, synchronize your server's time using an NTP service.
DNS validation does not require opening any ports; it simply involves adding a TXT record to your DNS configuration. This is currently the most reliable method for validation.
If you have verified all the above steps and the certificate still cannot be issued, check whether your server is using a "clean" (untainted) dedicated IP address. An IP address with a poor reputation or one that has been "polluted" (blacklisted or associated with malicious activity) may cause the validation authority to block your request.
Cloud server solutions from Jtti come standard with clean, dedicated public IP addresses—effectively eliminating security risks associated with shared IPs. Furthermore, they leverage a stable CN2 GIA network to ensure that validation requests are delivered seamlessly, making them a reliable foundation for building HTTPS-enabled corporate websites and independent cross-border e-commerce stores. Additionally, a "same-price renewal" policy ensures that the long-term costs of maintaining your website remain fully predictable and manageable.
