Não é possível conectar-se a https no ubuntu - “Erro de protocolo SSL desconhecido”

Question

Não consigo me conectar a um servidor específico por SSL dos nossos servidores Ubuntu. Localmente, no meu Mac, funciona perfeitamente.

O endereço do servidor: powerschool.spokaneschools.org

curl -v https://powerschool.spokaneschools.org output:

• Rebuilt URL to: https://powerschool.spokaneschools.org/
• Hostname was NOT found in DNS cache
• Trying 206.193.1.72...
• Connected to powerschool.spokaneschools.org (206.193.1.72) port 443 (#0)
• successfully set certificate verify locations:
• CAfile: none CApath: /etc/ssl/certs
• SSLv3, TLS handshake, Client hello (1):
• Unknown SSL protocol error in connection to powerschool.spokaneschools.org:443
• Closing connection 0 curl: (35) Unknown SSL protocol error in connection to powerschool.spokaneschools.org:443

openssl s_client -connect powerschool.spokaneschools.org:443 output:

CONNECTED(00000003)
write:errno=104
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 0 bytes and written 0 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : SSLv3
    Cipher    : 0000
    Session-ID: 
    Session-ID-ctx: 
    Master-Key: 
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1466726411
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
---

Eu tentei verificar o site em diferentes ferramentas de verificação de SSL, tudo parece estar bem (além de alguns problemas de segurança). Não tenho problemas para me conectar a outros servidores, mesmo dentro desse domínio.

SO

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.4 LTS
Release:        14.04
Codename:       trusty

$ curl -V
curl 7.35.0 (x86_64-pc-linux-gnu) libcurl/7.35.0 OpenSSL/1.0.1f zlib/1.2.8 libidn/1.28 librtmp/2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtmp rtsp smtp smtps telnet tftp 
Features: AsynchDNS GSS-Negotiate IDN IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP 

$ openssl version -a
OpenSSL 1.0.1f 6 Jan 2014
built on: Mon May  2 16:53:18 UTC 2016
platform: debian-amd64
options:  bn(64,64) rc4(16x,int) des(idx,cisc,16,int) blowfish(idx) 
compiler: cc -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -m64 -DL_ENDIAN -DTERMIO -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -Wl,-Bsymbolic-functions -Wl,-z,relro -Wa,--noexecstack -Wall -DMD32_REG_T=int -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM
OPENSSLDIR: "/usr/lib/ssl"

    

Answer 1

Isso funciona para mim e deve funcionar com sua versão curl / openssl também. errno 104 significa uma redefinição de conexão, portanto, suponho que alguma middlebox como um firewall esteja causando o problema. Verifique em outra rede onde você pode ter certeza de que não há firewalls envolvidos.