Http Connection Refused Error Code
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Sign up What can be the reasons of connection refused errors? up vote 47 down vote favorite 6 I'm trying to write a server program in C, using another client, I get this error when I try to connect through port http response example 2080 for example. connection refused What can be the reasons of this error? c sockets share|improve this question asked Feb 25 '10 at 10:55 Zenet 1,43262538 I just got this error, because of a mistake of the server where I host my website. The server could still be pinged, downforeveryoneorjustme.com showed that it's not just me and I could also still access it via FTP. After a couple of minutes the mistakes was resolved. –Martin Thoma Dec 1 '14 at 16:39 http 422 1 @moose: ping does not tell you whether a specific port is accessible ad listening, only whether the IP address is reachable. But connect() depends on a specific IP and port being ready for use. –Remy Lebeau May 21 '15 at 19:02 Server Fault has a canonical question about Connection Refused. –Raedwald Sep 30 '15 at 12:34 add a comment| 9 Answers 9 active oldest votes up vote 40 down vote accepted There could be many reasons, but the most common are: The port is not open on the destination machine. The port is open on the destination machine, but its backlog of pending connections is full. A firewall between the client and server is blocking access (also check local firewalls). After checking for firewalls and that the port is open, use telnet to connect to the ip/port to test connectivity. This removes any potential issues from your application. share|improve this answer edited May 21 '15 at 18:55 Remy Lebeau 232k13143273 answered Feb 25 '10 at 11:02 a'r 20.5k33755 3 Firewalls would normally give timeout errors, as the connect (SYN) packet is just discarded. Connection refused is because the server has received and rejected the SYN packet. –CuriousPanda Feb 25 '10 at 11:04 8 Not always, as firewalls can be configured to reject rather than drop the packets. –a'r Feb 25 '10 at 11:05 connect() with incorrect Server IP address and port number configuration in client program will also res
referer DNT X-Forwarded-For Status codes 301 Moved Permanently 302 Found 303 See Other 403 Forbidden 404 Not Found 451 Unavailable For Legal Reasons v t e This is a list of Hypertext Transfer Protocol (HTTP) response status codes. It includes
Http 403
codes from IETF internet standards, other IETF RFCs, other specifications, and some additional commonly used http 404 codes. The first digit of the status code specifies one of five classes of response; an HTTP client must recognise these five
Http 502
classes at a minimum. The phrases used are the standard wordings, but any human-readable alternative can be provided. Unless otherwise stated, the status code is part of the HTTP/1.1 standard (RFC 7231).[1] The Internet Assigned Numbers Authority http://stackoverflow.com/questions/2333400/what-can-be-the-reasons-of-connection-refused-errors (IANA) maintains the official registry of HTTP status codes.[2] Microsoft IIS sometimes uses additional decimal sub-codes to provide more specific information,[3] but not all of those are here (note that these sub-codes only appear in the response payload and in documentation; not in the place of an actual HTTP status code). Contents 1 1xx Informational 2 2xx Success 3 3xx Redirection 4 4xx Client Error 5 5xx Server Error 6 Unofficial codes 6.1 Internet https://en.wikipedia.org/wiki/List_of_HTTP_status_codes Information Services 6.2 nginx 6.3 Cloudflare 7 See also 8 Notes 9 References 10 External links 1xx Informational[edit] Request received, continuing process. This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line. Since HTTP/1.0 did not define any 1xx status codes, servers must not[note 1] send a 1xx response to an HTTP/1.0 client except under experimental conditions.[4] 100 Continue The server has received the request headers and the client should proceed to send the request body (in the case of a request for which a body needs to be sent; for example, a POST request). Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient. To have a server check the request's headers, a client must send Expect: 100-continue as a header in its initial request and receive a 100 Continue status code in response before sending the body. The response 417 Expectation Failed indicates the request should not be continued.[2] 101 Switching Protocols The requester has asked the server to switch protocols and the server has agreed to do so.[5] 102 Processing (WebDAV; RFC 2518) A WebDAV request may contain many sub-requests involving file operations, requiring a long time to complete the request. This co
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the http://serverfault.com/questions/725262/what-causes-the-connection-refused-message company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top What causes the 'Connection Refused' message? up http status vote 27 down vote favorite 11 This is a Canonical Question about Connection Refused We see a lot of questions to the effect When I try to connect to a system I get a message Connection refused Why is this ? networking connection-refused share|improve this question edited Sep 28 '15 at 16:54 HBruijn♦ 32.2k65287 asked Sep 28 '15 at 12:13 Hangin on in quiet desperation 88.2k9115201 add a comment| 2 Answers 2 active oldest http status code votes up vote 36 down vote accepted Note: This message is a symptom of the problem you are trying to solve. Understanding the cause of the message will ultimately lead you to solving your problem. The message 'Connection Refused' has two main causes: Nothing is listening on the IP:Port you are trying to connect to. The port is blocked by a firewall. No process is listening. This is by far the most common reason for the message. To determine if this is the problem, on the remote system run netstat or ss1 e.g. if you are expecting a process to be listening on port 22222 sudo netstat -tnlp | grep :22222 or ss -tnlp | grep :22222 For OSX a suitable command is sudo netstat -tnlp tcp | grep '\.80 ' If nothing is listening then the above will produce no output. If you see some output then confirm that it's what you expect then see the firewall section below. If you don't have access to the remote system and want to confirm the problem before reporting it to the relevant administrators you can use tcpdump (wireshark or similar). When a connection is attempted to an IP:port where nothing is listening, the response from the remote system to the initial SYN packet is a packet with the flags RST,ACK set