TLS在服务器盒中失败，但在本地运行良好

我有一个网站通过https调用web API，一切都在C#.net中，它运行得很好，直到API的提供商更改证书以删除SSL，我开始获得：

Authentication failed because the remote party has closed the transport stream.

在修复后，我添加了：

ServicePointManager.SecurityProtocol = 
        SecurityProtocolType.Tls | 
        SecurityProtocolType.Tls11 | 
        SecurityProtocolType.Tls12;

为了只允许tls密码，我在实时环境中调用的相同URL在本地一切都很好，但在实时服务器上我仍然得到：

Authentication failed because the remote party has closed the transport stream.

我确保代码是更新的，应用程序池是回收的，注册密钥上的Tls协议是启用的。

有人有什么建议吗？这是一个API是公共的第三方一

检索证书的OPENSSL调用：

$ openssl s_client -showcerts -connect ws.purple-parking.com:443
CONNECTED(00000003)
depth=0 /1.3.6.1.4.1.311.60.2.1.3=GB/2.5.4.15=Private Organization/serialNumber=
02341479/C=GB/ST=MIDDLESEX/L=Southall/O=Purple Parking Limited/CN=www.purpleparking.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 /1.3.6.1.4.1.311.60.2.1.3=GB/2.5.4.15=Private Organization/serialNumber=
02341479/C=GB/ST=MIDDLESEX/L=Southall/O=Purple Parking Limited/CN=www.purpleparking.com
verify error:num=27:certificate not trusted
verify return:1
depth=0 /1.3.6.1.4.1.311.60.2.1.3=GB/2.5.4.15=Private Organization/serialNumber=02341479/C=GB/ST=MIDDLESEX/L=Southall/O=Purple Parking Limited/CN=www.purpleparking.com
verify error:num=21:unable to verify the first certificate
verify return:1
---
Certificate chain
0 s:/1.3.6.1.4.1.311.60.2.1.3=GB/2.5.4.15=Private Organization/serialNumber=023
41479/C=GB/ST=MIDDLESEX/L=Southall/O=Purple Parking Limited/CN=www.purpleparking.com
   i:/C=US/O=thawte, Inc./CN=thawte EV SSL CA - G3
-----BEGIN CERTIFICATE-----
MIIGnTCCBYWgAwIBAgIQFINUUfQAQ/jRmnwUyl5IODANBgkqhkiG9w0BAQsFADBE
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-----END CERTIFICATE-----
1 s:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=Terms of use at https://www.verisign.com/rpa (c)06/CN=VeriSign Class 3 Extended Validation SSL SGC CA
   i:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc.
- For authorized use only/CN=VeriSign Class 3 Public Primary Certification Authority - G5
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
2 s:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc.
- For authorized use only/CN=VeriSign Class 3 Public Primary Certification Authority - G5
   i:/C=US/O=VeriSign, Inc./OU=Class 3 Public Primary Certification Authority
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
---
Server certificate
subject=/1.3.6.1.4.1.311.60.2.1.3=GB/2.5.4.15=Private Organization/serialNumber=
02341479/C=GB/ST=MIDDLESEX/L=Southall/O=Purple Parking Limited/CN=www.purpleparking.com
issuer=/C=US/O=thawte, Inc./CN=thawte EV SSL CA - G3
---
No client certificate CA names sent
---
SSL handshake has read 5457 bytes and written 444 bytes
---
New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA
Server public key is 2048 bit
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1
    Cipher    : DHE-RSA-AES256-SHA
    Session-ID: F286D708BDD3413C688722CCC5C89DA65217668DF16739C6495A8EF4216B3C76
    Session-ID-ctx:
    Master-Key: 806065D476B184621B040B4E6E9E384BEDECF90551946E6B68AB6ABA530C5C208735676C249F06E56D081062017660E4
    Key-Arg   : None
    Start Time: 1435830533
    Timeout   : 300 (sec)
    Verify return code: 21 (unable to verify the first certificate)
---
read:errno=0