curl error 35 : unknown SSL protocol error in connection

user_175296 0
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$ curl -I https://9.185.173.135
curl: (35) Unknown SSL protocol error in connection to 9.185.173.135:443

This is an secured page that I need to access. But I don't know how to obtain its certificate file. I tried to use Firefox, but it says couldn't get any ssl certificate once the url is entered.

$ curl -I http://9.185.173.135
HTTP/1.1 200 OK
Content-Length: 686
Content-Type: text/html
Content-Location: http://9.185.173.135/Default.htm
Last-Modified: Mon, 16 Mar 2009 05:05:38 GMT
Accept-Ranges: bytes
ETag: "a851dbd8f4a5c91:d41"
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Date: Tue, 13 Jul 2010 04:09:35 GMT

The server is definitely reachable from my laptop. Once I get the certificate file, I assume I can then import it to Firefox and then use my credentials to pass the authentication (I already got the username/password).

Sorry I am no expert in security at all. Is there anything else I can try?

Many thanks in advance.

curl ssl-certificate ssl
8 Answers

You can use --tlsv1 option to solve the issue in case the curl version is below 7.34 

 curl -I --tlsv1 https://9.185.173.135
user_103385330

In my case on a AIX VM also this problem, use --cacert to specific a cacert.pem

curl --cacert /var/ssl/cacert.pem https://localhost:3000

user_44320990

i have some solutions that fix the issue for me:

1] try update your curl/php/apache [ yum update ]

2] restart apache

Those worked for me!

user_20710280

I had a similar issue:

 curl https://localhost:3000
 ...
 curl: (35) Unknown SSL protocol error in connection to localhost:-9847

(not sure where that number -9847came from since I requested port 3000)

fix: turns out my server on port 3000 was running "http" not "https" go figure.

user_324530
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