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Check error messages explained

What FastPing check and validation errors mean, from connection refused and timeouts to certificate and DNS errors, and how to fix each one.

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When saving a monitor

MessageWhat it meansWhat to do
Private or reserved addresses are not allowed.The IP address is private, loopback, link-local or reserved (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 127.0.0.0/8, 100.64.0.0/10…). FastPing never connects to such addresses.Use the public address of the service.
Private hostnames are not allowed.Names such as localhost or ones ending in .local, .internal or .localhost only exist inside a private network.Use the public hostname.
Invalid hostname.The text is not a valid domain name (spaces, underscores, missing dot…).Enter only the host, such as example.com, without paths or ports.
Only http and https URLs are supported.The URL uses another scheme, such as ftp:// or ws://.Use http:// or https://.
Credentials in URLs are not allowed.The URL contains user:password@.Remove the credentials; for authenticated endpoints, use an API monitor with an Authorization header.
Enter a port.This monitor type needs a port.Enter the port number.
Port must be between 1 and 65535.The port is outside the valid range.Enter a port from 1 to 65535.
Verify the domain first.Security scans only run on verified domains.Verify the domain under Verified domains.
This monitor type requires the Security exposure scans add-on. Upgrade under Plan & billing.The type needs an add-on your plan does not include.Add it to your plan.

Connection and DNS

MessageWhat it meansWhat to do
Could not resolve shop.example.com.DNS has no address for the name.Check the A/AAAA records and spelling.
Hostname resolves to a private or reserved address.The DNS record points to a private address.Point the record to the public address, or monitor another name.
connect ECONNREFUSED 203.0.113.10:443The host refused the connection: nothing listens on the port, or a firewall rejects it.Start the service or open the port for FastPing.
socket hang upThe connection was closed before a response arrived.Often a WAF, proxy or rate limiter; see the firewall guide.
read ECONNRESETThe connection was reset mid-way.Same causes as above; also overloaded servers.
Timed out after 15sNo response within the monitor's timeout.Check the server; raise the timeout for slow endpoints.
Check timed outThe whole check took longer than 90 seconds and was stopped.The target is extremely slow or stalls connections.

Messages by monitor type

Each monitor type's article lists its own messages:

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