In this article, you will find reports for the following checks:
HTTP Check
The HTTP check may return the following errors and warnings:
- Errors
- Warning
Response Error
The system expects a response with a status of 200 OK. If it receives any other response, it will issue an error message. The most common errors are:
- 301 Moved permanently: The page is permanently redirected to another domain address. It can be set on the domain or via .htaccess file.
- 302 Found: The page is redirected, but the redirect does not have the permanent flag (301).
- 403 Forbidden: The address is unavailable.
- 404 Not Found: Target file wasn’t found.
- 500 Internal Server Error: An unspecified internal server error has occurred.
- 502 Bad Gateway: A proxy or connection error occurred.
Slow
A 200 OK response arrived, but later than the time you set (2000 ms by default).
Unavailable
If the server does not return any response at all, it can be in one of the following states:
- Operation timed out after X milliseconds with 0 bytes received. The connection was established successfully, but no data was received from the server. The server may be overloaded or misconfigured.
- Failed to connect to domena.tld port 443: Connection refused. The server refused the connection. There may be a problem with SSL settings, access permissions, or the server is down.
- Failed to connect to www.example.com port 443: No route to host. The server is unavailable. It could be a network problem or the IP address is not available – check your DNS settings and server configuration.
- Could not resolve host: domain.tld. An error occurred during DNS resolution. Check DNS record settings and DNS server availability.
- Resolving timed out. Timed out while communicating with DNS. Check DNS settings and DNS server availability.
- Connection timed out after X milliseconds. Timed out trying to connect to the server. Check your web server settings.
- SSL read error: Connection reset by peer (errno104). Establishing the SSL / TLS connection was interrupted. There may be a problem with the SSL certificate or server settings.
- HTTPS certificate error: Untrusted CA or missing intermediate certificate. The certification authority is not trusted, or an intermediate certificate is missing. Check the SSL certificate settings and validity.
- SSL certificate problem: certificate has expired. SSL certificate expired. Check the validity of the SSL certificate and update it if necessary.
Certificate About to Expire
The listed SSL certificate will expire soon. Verify the validity of your certificate, or obtain a new one. If you are using a Let’s Encrypt certificate issued by us, contact support.
IP Blacklisted
The server’s IP address is blacklisted.
Domain Blacklisted
The domain is blacklisted.
Ping Check
The Ping check can return the following reports:
- Unavailable – No response
- Unavailable – Could not resolve hostname
- Partially unavailable – Packet loss
No response
Detail example: 12 sent, 0 received, 12 lost.
The server did not return any response to the sent packets. The server may be (temporarily) unavailable or incorrectly configured.
Could not resolve hostname
Unable to resolve domain name to IP address. You can probably find the problem in the DNS server settings or domain records.
Packet Loss
Detail example: 12 sent, 10 received, 2 lost.
Some of the packets get through, but not all of them. The problem could be an unstable network or an overloaded server.