Trying to make a curl https request to Twitter API and get this error.

I've tried from another server and it works with no problem.

Does anyone know the reason for this error?

[root@webscoming httpdocs]# curl -v https://api.twitter.com
* About to connect() to api.twitter.com port 443 (#0)
*   Trying connected
* Connected to api.twitter.com ( port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* NSS error -5990
* Closing connection #0
* SSL connect error
curl: (35) SSL connect error


My server is running CentOs 6.5

Looks like Twitter could be blocking the connection since I can correctly connect to encrypted.google.com

  • Describe your server. – Michael Hampton Jun 18 '14 at 15:56
  • Could there be some type of web proxy in place that is causing it to fail? – user247200 Oct 8 '14 at 17:55

I saw a similar kind of problem, yet not accessing twitter.
Problem I saw was on RHEL 6.1 -> RHEL 6.4, using curl to access a REST API. curl showed error: curl: (35) SSL connect error

Issue ended up being that our server running the REST API was RHEL 6.6, using a newer version of NSS. Once we upgraded the client NSS version curl was successful.

We upgraded the client from: nss-3.12.10-2.el6_1.x86_64

to: nss-3.16.1-14.el6

  • 1
    This is a winner. Had a nearly identical scenario, this was the resolution. – Tim Jun 3 '15 at 16:40
  • ditto. (Satellite) server had been upgraded between runs from the (RHEL 6.5) client; couldn't update anything until this was done. – Otheus Feb 1 '17 at 17:10

According to the source code that error means a time out. Your network connection to that host is most likely faulty. It might also be that Twitter filters out your IP for whatever reason.

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