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Re: cert verification problem on curl handle re-use

From: Oscar Koeroo <>
Date: Sun, 20 Jan 2013 15:14:23 +0100

On 20-01-13 13:17, Michael Barton wrote:
> Hi!
> I'm having a problem with libcurl that so far seems to only happen on
> CentOS/RHEL 5.8 (libcurl 7.15.5 and openssl 0.9.8e). The first https
> request I make on a curl handle succeeds, but all subsequent requests give
> me a cert verification failure. If I disable CURLOPT_SSL_VERIFYHOST or
> make a new curl handle for each request, everything works fine. But
> obviously I'd prefer to avoid those. If anyone has ideas on fixing this,
> I'd love to hear them.
> This is enough to reproduce the problem:
> Output:


> - Mike

Hi Mike,

This site is a bad example. I'm getting a 404 when I try that link. I
believe the first call worked, the other 5 subsequent calls didn't. This
could be a side effect of this URL.

I change to my work's URL being "" and it worked on my
laptop. So your code should've worked too, but my libcurl is 7.28-1 and
using DarwinSSL at the moment.

I moved it to my CentOS 5 VM and observe the exact same problem. I'm using
the same stock libcurl version there and indeed something is not right. My
second call to my URL failed.

I believe the OpenSSL context is not reset properly or something along those
lines in the version curl-7.15.5-15.el5.

My intermediate conclusion is that this problem is solved in a future
version of libcurl.


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Received on 2013-01-20