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Strange Problem With Curl, Port 80, and IPTables - RESOLVED
https://forum.linode.com/viewtopic.php?f=19&t=10391		 Page 1 of 1
Author:  jziering [ Tue Sep 03, 2013 11:00 pm ]
Post subject:  Strange Problem With Curl, Port 80, and IPTables - RESOLVED
Hello all,

I'm dealing with a challenging problem on my server that's causing a lot of symptoms. I've narrowed down what I think is the root problem. Here's where I'm at:

1) My Curl is not able to access Port 80. Other ports work no problem. So I can CURL any https URL, but not http URLS.
2) The problem isn't CURL, as when I use SVN, I can use repos that are https, but not http.
3) IP Tables seems to be OK as far as configuration goes, but there does appear to be a problem when I restart it. Here's what happens when I run iptables -;
https://pastebin.linode.com/8064

4) Here's what happens when I issue service iptables restart

Image

As you can imagine, this is all quite frustrating since PHP wraps CURL and pretty much everything is broken. Yum is even broken.

Thank you,


Josh
Author:  Ttech [ Tue Sep 03, 2013 11:11 pm ]
Post subject:  Re: Strange Problem With Curl, Port 80, and IPTables
What does iptables -S say? I'm leaning toward your output rules.
Author:  jziering [ Tue Sep 03, 2013 11:16 pm ]
Post subject:  Re: Strange Problem With Curl, Port 80, and IPTables
Quote:
root@li [~]# iptables -S
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT
Author:  dwfreed [ Tue Sep 03, 2013 11:23 pm ]
Post subject:  Re: Strange Problem With Curl, Port 80, and IPTables
jziering wrote:
Hello all,

I'm dealing with a challenging problem on my server that's causing a lot of symptoms. I've narrowed down what I think is the root problem. Here's where I'm at:

1) My Curl is not able to access Port 80. Other ports work no problem. So I can CURL any https URL, but not http URLS.
2) The problem isn't CURL, as when I use SVN, I can use repos that are https, but not http.
3) IP Tables seems to be OK as far as configuration goes, but there does appear to be a problem when I restart it. Here's what happens when I run iptables -;
https://pastebin.linode.com/8064

4) Here's what happens when I issue service iptables restart

Image

As you can imagine, this is all quite frustrating since PHP wraps CURL and pretty much everything is broken. Yum is even broken.

Thank you,


Josh


Pastebin the output of the following when curl is having this problem:

iptables-save

For #4, that is a problem with CentOS not understanding what the security table is. There's a patch for it, but the site hosting it is currently down, and I can't find another copy anywhere.
Author:  jziering [ Tue Sep 03, 2013 11:33 pm ]
Post subject:  Re: Strange Problem With Curl, Port 80, and IPTables
https://p.linode.com/8065
Author:  Ttech [ Tue Sep 03, 2013 11:35 pm ]
Post subject:  Re: Strange Problem With Curl, Port 80, and IPTables
out of curiosity what are the contents of /etc/sysconfig/iptables?
Author:  jziering [ Tue Sep 03, 2013 11:39 pm ]
Post subject:  Re: Strange Problem With Curl, Port 80, and IPTables
Here you are:

https://p.linode.com/8066
Author:  jziering [ Wed Sep 04, 2013 12:28 am ]
Post subject:  Re: Strange Problem With Curl, Port 80, and IPTables - RESOL
Thanks Linode Support and everyone who responded.
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