In Partnership with AOL Search

DMOZ: Open Directory Project

Advanced: Full Robozilla Error Code List

Back to How to Handle Robozilla Errors
Code Meaning
500: Server errors
505 HTTP Version Not Supported The server does not support the HTTP protocol version that was used in the request message. Should never happen with Robozilla; if it does, the server might be misconfigured.
504 Gateway Timeout A server being used by this server has not responded in time.
503 Server Overload Service temporarily overloaded. The server cannot process the request due to a high load.
502 Bad Gateway The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request. Might be transient; hold for a few days and see if it clears up.
501 Not Implemented Function not implemented in Web server software. Might occur when a site is moved to a different platform (operating system). Look for an updated URL.
500 Server error Sometimes happens due to a server misconfiguration. Usually this is transient, and goes away, but check first.
400: Client errors
417 Expectation Failed The expectation given in an Expect request-header field could not be met by this server. Should never happen to Robozilla.
416 Requested Range Not Satisfiable A browser which sends information on acceptable file size as part of its request, has requested a file that does not fit these parameters. Since Robozilla does not send this header, this shouldn't happen unless the server is misconfigured.
415 Unsupported Media Type The server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method. Back up a few levels and see if there's an alternate version of the page you're looking for.
414 Request-URI Too Large The URL (usually created by a GET form request) is too large for the server to handle. Check to see that a lot of garbage didn't somehow get pasted in after the URL.
413 Request Entity Too Large The server is refusing to process a request because the request entity is larger than the server is willing or able to process. Should never occur for Robozilla.
412 Precondition Failed The precondition given in one or more of the request-header fields evaluated to false when it was tested on the server. Should never occur for Robozilla.
411 Length Required The server requires a content-length in the request. Should never occur for Robozilla.
410 Gone The resource doesn't exist at all. The page was removed by the webmaster. This page should be deleted.
409 Conflict The request could not be completed due to a conflict with the current state of the resource. Typically indicates defective programming of the Web server.
408 Request Time-Out The server took longer than expected to return a page, and timed out. Similar to -5, but generated by the server, rather than Robozilla.
407 Proxy Authentication Required This code is similar to 401 (Unauthorised), but indicates that the client must first authenticate itself with the proxy. Since Robozilla doesn't use a proxy, this should never occur unless on a faulty server.
406 Not Acceptable The server cannot generate a response that the requester is willing to accept.
405 Method Not Allowed Usually happens when a CGI script doesn't allow GET requests any longer. Backtrack the URL and see if you can find another way to show the data.
404 Not Found The resource doesn't exist on this server. The page was probably removed.
403 Forbidden You can't see this resource on the server. The admin may have turned off the pages because of load or for some other reason.
402 Payment Required. This resource cannot be accessed without payment.
401 Unauthorised You can't see this resource on the server. Perhaps a password is now required, or the resource you're looking for has moved.
400 Bad Request Usually occurs due to a space in the URL or other malformed URL syntax. Try converting spaces to %20 and see if that fixes the error.
300: Redirection
303 See Other The page has a new URL. Update the listing to the new URL.
302 Redirect Temporarily The page has a new URL temporarily (in theory; in practice, this is often used as a synonym for code 301). Update the listing to the new URL.
301 Redirect Permanently The page has a new URL. Update the listing to the new URL.
300 Moved The page has moved to one of several possibilities. Pick the one that's closest to the original page, and update the URL.
0/negative: Connection errors
0 Unknown error Probably a DNS error.
-1 Unable to Resolve Host Probably a typo in the host name or they didn't pay their bill for their Domain name.
-4 Can't connect We can't connect to the HTTP server. The server is there but it didn't want to talk to Robozilla on the specified port.
-5 Timeout Robozilla connected OK, and sent the request but Robozilla timed out waiting to fetch the page. This happens sometimes on really busy servers.
-6 Bad URL There was a problem with the format of the URL. Perhaps http:// is missing? Note: when you click on the [edit] link for a URL missing http://, the edit page for the site comes up with http:// helpfully attached by the dmoz software, and the URL link therefore works. You still have to click Update (not "This URL works for me") in order for the update to take effect.
-7 Server Error The server returned an unknown error code, and is probably misconfigured. The page may still show up okay, but it's a good idea to check it just in case.
Back to How to Handle Robozilla Errors