HTTP and other status codes in SolarWinds Observability

When you monitor your websites or URIs through SolarWinds Observability Synthetic monitoring , you may encounter outages. Outages can occur when any site or server doesn't respond with an HTTP 200 status of OK, and instead responds with an HTTP error message. See the table below for information about errors you may encounter.

Check Type	Short Description	Detailed Description
HTTP	Timeout (> 30s)	The page took too long to load and timed out.
HTTP	HTTP Error 400	HTTP Server Error 400 Bad Request
HTTP	HTTP Error 401	HTTP Server Error 401 Unauthorized
HTTP	HTTP Error 403	HTTP Server Error 403 Forbidden
HTTP	HTTP Error 404	HTTP Server Error 404 Not Found
HTTP	HTTP Error 405	HTTP Server Error 405 Method Not Allowed
HTTP	HTTP Error 406	HTTP Server Error 406 Not Acceptable
HTTP	HTTP Error 407	HTTP Server Error 407 Proxy Authentication Required
HTTP	HTTP Error 408	HTTP Server Error 408 Request Timeout
HTTP	HTTP Error 500	HTTP Server Error 500 Internal Server Error
HTTP	HTTP Error 502	HTTP Server Error 502 Bad Gateway
HTTP	HTTP Error 503	HTTP Server Error 503 Service Unavailable
HTTP	HTTP Error 504	HTTP Server Error 504 Gateway Timeout
HTTP	HTTP Error 505	HTTP Server Error 505 HTTP Version Not Supported
HTTP	No data from server	No data received from server
HTTP	Required string missing	The required string was not found
HTTP	Invalid HTTP response	Invalid HTTP response received from server
HTTP	Too many redirections	Maximum redirection depth reached
HTTP	Infinite redirection loop	Redirection creates an infinite loop
HTTP	SSL connection error	Cannot make SSL connection - Error on receive
HTTP	Timeout (> 30s)	Socket timeout, unable to connect to server
HTTP	Connection refused	Connection refused by server
HTTP	Unknown target	The URL is invalid or the server was not found
HTTP	Network error	Network is unreachable
HTTP	Network error	No route to host
HTTP	DNS error	Temporary failure in name resolution
HTTP	Connection reset	Connection reset by peer
HTTP	DNS error	Non-recoverable failure in name resolution
HTTP	Unknown target	The URL is invalid or the server was not found
HTTP	Unknown error	Unknown internal error
HTTP	Redirection error	Could not find redirect location
HTTP	SSL connection error	Cannot make SSL connection - No data received from server
HTTP	Connection reset	Error on receive
HTTP	Forbidden string found	The string that should not exist on the page was found
HTTP	HTTP Error 413	HTTP Server Error 413 Request Entity Too Large
HTTP	HTTP Error 507	HTTP Server Error 507 Unexpected error
HTTP	HTTP Error 520	HTTP Error 520
Ping	Timeout	Forced timeout
Ping	Packet loss	Packet loss occurred
Ping	Unknown target	Invalid hostname/address
Ping	Timeout	Time to live exceeded
Ping	Network error	Host Unreachable
Ping	Unknown error	Unknown internal error
Ping	Timeout	Ping timed out
Ping	Network error	Host not found
Ping	Network error	Multiple hosts responded
Ping	Unknown error	Unknown internal error
Ping	Timeout	Ping timed out
Ping	Network error	Port unreachable
Ping	Unknown error	Unknown internal error
TCP Port	Timeout (> 30s)	The connection took too long to establish
TCP Port	Unknown target	Invalid hostname, address or socket
TCP Port	Connection refused	Connection refused by host
TCP Port	Timeout (> 30s)	Socket timeout
TCP Port	Network error	No route to host
TCP Port	Network error	Network is unreachable
TCP Port	Unknown target	Name or service not known
TCP Port	Unknown target	Servername was not provided or unknown
TCP Port	DNS error	Temporary failure in name resolution
TCP Port	Connection reset	Connection reset
TCP Port	Invalid response	Unexpected response from host/socket

HTTP Status Codes

Check Type	Short Description	Long Description
HTTP	HTTP 100 Continue	HTTP request has been received.
HTTP	HTTP 101 Switching Protocols	HTTP request to switch protocols.
HTTP	HTTP 102 Processing	HTTP Processing request.
HTTP	HTTP 103 Early Hints	HTTP returns some headers before final message.
HTTP	HTTP 200 OK	HTTP successful request.
HTTP	HTTP 201 Created	HTTP created resource.
HTTP	HTTP 202 Accepted	HTTP accepted for processing.
HTTP	HTTP 203 Non-Authoritative Information
HTTP	HTTP 204 No Content	HTTP not returning content.
HTTP	HTTP 205 Reset Content	HTTP processed request, but is not returning content.
HTTP	HTTP 206 Reset Content	HTTP is returning partial content.
HTTP	HTTP 207 Multi-Status	HTTP multi status
HTTP	HTTP 208 Already Reported	HTTP already reported
HTTP	HTTP 226 IM Used	HTTP IM used
HTTP	HTTP 300 Multiple Choices
HTTP	HTTP 301 Moved Permanently	HTTP request should be redirected to given URI
HTTP	HTTP 302 Found	HTTP to browse to another URL
HTTP	HTTP 303 See Other	HTTP GET to another URI
HTTP	HTTP 304 Not Modified	HTTP Not modified
HTTP	HTTP 305 Use Proxy	HTTP request only available through proxy
HTTP	HTTP 307 Temporary Redirect	HTTP temporary redirect to URI
HTTP	HTTP 308 Permanent Redirect	HTTP permanent redirect to given URI
HTTP	Timeout (> 30s)	The page took too long to load and timed out.
HTTP	HTTP Error 400	HTTP Server Error 400 Bad Request
HTTP	HTTP Error 401	HTTP Server Error 401 Unauthorized
HTTP	HTTP Error 403	HTTP Server Error 403 Forbidden
HTTP	HTTP Error 404	HTTP Server Error 404 Not Found
HTTP	HTTP Error 405	HTTP Server Error 405 Method Not Allowed
HTTP	HTTP Error 406	HTTP Server Error 406 Not Acceptable
HTTP	HTTP Error 407	HTTP Server Error 407 Proxy Authentication Required
HTTP	HTTP Error 408	HTTP Server Error 408 Request Timeout
HTTP	HTTP Error 500	HTTP Server Error 500 Internal Server Error
HTTP	HTTP Error 502	HTTP Server Error 502 Bad Gateway
HTTP	HTTP Error 503	HTTP Server Error 503 Service Unavailable
HTTP	HTTP Error 504	HTTP Server Error 504 Gateway Timeout
HTTP	HTTP Error 505	HTTP Server Error 505 HTTP Version Not Supported
HTTP	No data from server	No data received from server
HTTP	Required string missing	The required string was not found
HTTP	Invalid HTTP response	Invalid HTTP response received from server
HTTP	Too many redirections	Maximum redirection depth reached
HTTP	Infinite redirection loop	Redirection creates an infinite loop
HTTP	SSL connection error	Cannot make SSL connection - Error on receive
HTTP	Timeout (> 30s)	Socket timeout, unable to connect to server
HTTP	Connection refused	Connection refused by server
HTTP	Unknown target	The URL is invalid or the server was not found
HTTP	Network error	Network is unreachable
HTTP	Network error	No route to host
HTTP	DNS error	Temporary failure in name resolution
HTTP	Connection reset	Connection reset by peer
HTTP	DNS error	Non-recoverable failure in name resolution
HTTP	Unknown target	The URL is invalid or the server was not found
HTTP	Unknown error	Unknown internal error
HTTP	Redirection error	Could not find redirect location
HTTP	SSL connection error	Cannot make SSL connection - No data received from server
HTTP	Connection reset	Error on receive
HTTP	Forbidden string found	The string that should not exist on the page was found
HTTP	HTTP Error 413	HTTP Server Error 413 Request Entity Too Large
HTTP	HTTP Error 507	HTTP Server Error 507 Unexpected error
HTTP	HTTP Error 520	HTTP Error 520

Ping status codes

Check Type	Short Description	Long Description
Ping	Timeout	Forced timeout
Ping	Packet loss	Packet loss occurred
Ping	Unknown target	Invalid hostname/address
Ping	Timeout	Time to live exceeded
Ping	Network error	Host Unreachable
Ping	Unknown error	Unknown internal error
Ping	Timeout	Ping timed out
Ping	Network error	Host not found
Ping	Network error	Multiple hosts responded
Ping	Unknown error	Unknown internal error
Ping	Timeout	Ping timed out
Ping	Network error	Port unreachable
Ping	Unknown error	Unknown internal error
Ping	Timeout	Forced timeout
Ping	Packet loss	Packet loss occurred

TCP Port status codes

Check Type	Short Description	Long Description
TCP Port	Timeout (> 30s)	The connection took too long to establish
TCP Port	Unknown target	Invalid hostname, address or socket
TCP Port	Connection refused	Connection refused by host
TCP Port	Timeout (> 30s)	Socket timeout
TCP Port	Network error	No route to host
TCP Port	Network error	Network is unreachable
TCP Port	Unknown target	Name or service not known
TCP Port	Unknown target	Servername was not provided or unknown
TCP Port	DNS error	Temporary failure in name resolution
TCP Port	Connection reset	Connection reset
TCP Port	Invalid response	Unexpected response from host/socket