CURL ERROR Recv failure Connection reset by peer - PHP Curl

Question

I m having this strange error  CURL ERROR  Recv failure  Connection reset by peer  This is how it happens  if I did not connect to the server and all of a sudden trying to connect to the server via CURL in PHP I get the error  When I run the CURL script again the error disappears and then works well the whole time  if I leave the remote server idle for about 30mins or reboot the remote server and try to connect again  I get the error again  So it seems like the connection is idle and then all of sudden the server wakes up and then works and then sleeps again   This is how my CURL script looks    url   Yii  app  - gt params  pdfUrl                 body    title   urlencode  title    amp client url   Yii  app  - gt params  pdfClientURL     amp client id   Yii  app  - gt params  pdfClientID     amp content   urlencode htmlentities  content                  c   curl init   url                body   array                   client url   gt Yii  app  - gt params  pdfClientURL                     client id   gt Yii  app  - gt params  pdfClientID                     title   gt urlencode  title                    content   gt urlencode  content                              foreach  body as  key  gt  value     body str     key      value   amp                      rtrim  body str   amp                  curl setopt   c  CURLOPT POST  true               curl setopt   c  CURLOPT POSTFIELDS   body str               curl setopt   c  CURLOPT RETURNTRANSFER  true               curl setopt   c  CURLOPT CONNECTTIMEOUT   0               curl setopt   c  CURLOPT TIMEOUT    20                 pdf   curl exec   c                errorCode   curl getinfo  c  CURLINFO HTTP CODE                curlInfo   curl getinfo  c                curlError   curl error  c                curl close   c     I m totally out of ideas and solutions  please help  I ll appreciate it     If I verbose the output to see what happens using   curl setopt   c  CURLOPT VERBOSE  TRUE   curl setopt  c  CURLOPT STDERR   fp      I get the following    About to connect   to 196 41 139 168 port 80   0      Trying 196 x x x      connected   Connected to 196 x x x  196 x x x  port 80   0   gt  POST  serve  r pdf generatePdf HTTP 1 1 Host  196 x x x Accept      Content-Length  7115 Content-Type  application x-www-form-urlencoded Expect  100-continue    Recv failure  Connection reset by peer   Closing connection  0 012 20 23 49 GMT  lt  Server  Apache 2 2 15  CentOS   lt  X-Powered-By  PHP 5 3 3  lt  Connection  close  lt  Transfer-Encoding  chunked  lt  Content-Type  text html  charset UTF-8  lt     Closing connection  0   I ve added in the following toe remove the default header and still no luck    curl setopt   c  CURLOPT HTTPHEADER  array   Expect          gt  Accept      Content-Length  8414 Content-Type   gt  application x-www-form-urlencoded  gt    gt    Recv failure  Connection reset by peer  gt    Closing connection  0 r  Apache 2 2 15  CentOS   lt  X-Powered-By  PHP 5 3 3  lt  Connection  close  lt  Transfer-Encoding  chunked  lt   gt  Content-Type  text html  charset UTF-8  lt    gt    Closing connection  0

User · Accepted Answer

Introduction

The remote server has sent you a RST packet, which indicates an immediate dropping of the connection, rather than the usual handshake.

Possible Causes

A. TCP/IP

It might be TCP/IP issue you need to resolve with your host or upgrade your OS most times connection is close before remote server before it finished downloading the content resulting to Connection reset by peer.....

B. Kannel Bug

Note that there are some issues with TCP window scaling on some Linux kernels after v2.6.17. See the following bug reports for more information:

https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.17/+bug/59331

https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/89160

C. PHP & CURL Bug

You are using PHP/5.3.3 which has some serious bugs too ... i would advice you work with a more recent version of PHP and CURL

https://bugs.php.net/bug.php?id=52828

https://bugs.php.net/bug.php?id=52827

https://bugs.php.net/bug.php?id=52202

https://bugs.php.net/bug.php?id=50410

D. Maximum Transmission Unit

One common cause of this error is that the MTU (Maximum Transmission Unit) size of packets travelling over your network connection have been changed from the default of 1500 bytes. If you have configured VPN this most likely must changed during configuration

D. Firewall : iptables

If you don't know your way around this guys they would cause some serious issues .. try and access the server you are connecting to check the following

You have access to port 80 on that server

Example

 -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT`

The Following is at the last line not before any other ACCEPT

Example

  -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited

Check for ALL DROP , REJECT and make sure they are not blocking your connection
Temporary allow all connection as see if it foes through

Experiment

Try a different server or remote server ( So many fee cloud hosting online) and test the same script .. if it works then i guesses are as good as true ... You need to update your system

Others Code Related

A. SSL

If Yii::app()->params['pdfUrl'] is a url with https not including proper SSL setting can also cause this error in old version of curl

Resolution : Make sure OpenSSL is installed and enabled then add this to your code

curl_setopt($c, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($c, CURLOPT_SSL_VERIFYHOST, false);

I hope it helps

User · Answer

We had the same issue  in making a websocket connection to the Load Balancer  The issue is in LB  accepting http connection on port 80 and forwarding the request to node  tomcat app on port 8080   We have changed this to accept tcp  http has been changed as  tcp   connection on port 80  So the first handshake request is forwarded to Node and a websocket connection is made successfully on some random  as far as i know  may be wrong  port   below command has been used to test the websocket handshake process   curl -v -i -N -H  Connection  Upgrade  -H  Upgrade  websocket  -H  Host  localhost  -H  Origin  http   LB URL 80  http   LB URL   Rebuilt URL to  http LB URL  Trying LB URL    TCP NODELAY set Connected to LB URL  LB URL  port 80   0      GET   HTTP 1 1   Host  localhost   User-Agent  curl 7 60 0   Accept      Connection  Upgrade   Upgrade  websocket   Origin  http   LB URL 80  Recv failure  Connection reset by peer Closing connection 0 curl   56  Recv failure  Connection reset by peer

User · Answer

I faced same error but in a different way   When you curl a page with a specific SSL protocol   curl --sslv3 https   example com   If --sslv3 is not supported by the target server then the error will be      curl   35  TCP connection reset by peer   With the supported protocol  error will be gone   curl --tlsv1 2 https   example com

User · Answer

Normally this error means that a connection was established with a server but that connection was closed by the remote server  This could be due to a slow server  a problem with the remote server  a network problem  or  maybe  some kind of security error with data being sent to the remote server but I find that unlikely    Normally a network error will resolve itself given a bit of time  but it sounds like you   ve already given it a bit of time   cURL sometimes having issue with SSL and SSL certificates  I think that your Apache and or PHP was compiled with a recent version of the cURL and cURL SSL libraries plus I don t think that OpenSSL was installed in your web server   Although I can not be certain However  I believe cURL has historically been flakey with SSL certificates  whereas  Open SSL does not   Anyways  try installing Open SSL on the server and try again and that should help you get rid of this error

User · Answer

So what is the URL that Yii  app  - gt params  pdfUrl   gives   You say it should be https  but the log shows it s connecting on port 80    which almost no server is setup to accept https connections on   cURL is smart enough to know https should be on port 443    which would suggest that your URL has something wonky in it like  https   196 41 139 168 80 serve  r pdf generatePdf  That s going to cause the connection to be terminated  when the Apache at the other end cannot do https communication with you on that port   You realize your first  body definition gets replaced when you set  body to an array two lines later    Probably just an artifact of you trying to solve the problem   You re also not encoding the client url and client id values  the former quite possibly containing characters that need escaping    Oh and you re appending to  body str without first initializing it   From your verbose output we can see cURL is adding a content-length header  but    is it correct   I can see some comments out on the internets of that number being wrong  especially with older versions     if that number was to small  for example  you d get a connection-reset before all the data is sent   You can manually insert the header   curl setopt   c  CURLOPT HTTPHEADER      array  Content-Length     strlen  body str        Oh and there s a handy function http build query  that ll convert an array of name value pairs into a URL encoded string for you   All this rolls up into the final code    post http build query array     client url   gt Yii  app  - gt params  pdfClientURL       client id   gt Yii  app  - gt params  pdfClientID       title   gt  title     content   gt  content       Open to URL  c curl init Yii  app  - gt params  pdfUrl       Send post curl setopt   c  CURLOPT POST  true     Optional   try with without  curl setopt   c  CURLOPT HTTPHEADER  array  Content-Length    strlen  post      curl setopt   c  CURLOPT POSTFIELDS   post   curl setopt   c  CURLOPT RETURNTRANSFER  true   curl setopt   c  CURLOPT CONNECTTIMEOUT   0   curl setopt   c  CURLOPT TIMEOUT    20     Collect result  pdf   curl exec   c    curlInfo   curl getinfo  c   curl close  c

User · Answer

In my case there was problem in URL  I ve use https   example com - but they ensure  www   - so when i switched to https   www example com everything was ok  The proper header was sent  Host  www example com    You can try make a request in firefox brwoser  persist it and copy as cURL - that how I ve found it

User · Answer

This is a firewall issue  if you are using a VMware application  make sure the firewall on the antivirus is turned off or allowing connections   If this server is on a secure network  please have a look at firewall rules of the server   Thanks  Ganesh PNS

[php] CURL ERROR: Recv failure: Connection reset by peer - PHP Curl

Introduction

Possible Causes

Experiment

Others Code Related

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