Peer not recognized or badly formatted message received

I tried to post to the HTTPAPI newsgroup, I guess the link is broken again? I have an HTTPAPI program trying to connect to a new vendor. A similar process works with many of our other vendors. With the new vendor I'm getting the Peer not recognized or badly formatted message received. I read some other messages with this problem. I don't know a lot about SSL encryption ciphers but some other messages suggested that may be the issue. The site I'm connecting to is an https.

I am aware that we're on an old version of HTTPAPI, I'm currently working with the Operation staff to upgrade. I don't know if an older version of HTTPAPI could have anything to do with the issue.

My HTTP error log is at the bottom of this message. I'm doing an http_url_post_stmf.
The vendor gave me a list of information about their site including:
Their SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
Their Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH

I can provide the SOAP/XML I'm sending here if necessary, but since the problem appears to be with the handshake
so I don't think the issue is there.

I asked the Operations Manager to see if we have the Ciphers necessary for the SSL connection required. Our current operating system is V7R3M0. He sent me a print screen of QSSLPCL Secure sockets layer protocols and said we're already configured to support TSLv1.2.
The screen showed showed Protocols
*TLSV1.2
*TLSV1.1
*TLSV1
He sent me another print screen of our ciphers, which includes ECDHE_RSA_AES_128_GCM_SHA256.
Any advice that might guide me in the right direction would be appreciated.

Regards,
Charlie


Httpapi error log
HTTPAPI Ver 1.23 released 2008-04-24
OS/400 Ver V7R3M0

New iconv() objects set, PostRem=819. PostLoc=0. ProtRem=819. ProtLoc=0
http_url_post_stmf(): entered
getting post file size...
opening file to be sent...
opening file to be received
http_persist_open(): entered
http_long_ParseURL(): entered
DNS resolver retrans: 2
DNS resolver retry : 2
DNS resolver options: x'00000136'
DNS default domain: us.adler.corp
DNS default domain: us.adler.corp
DNS server found: 10.1.20.11
DNS server found: 10.1.20.12
https_init(): entered
--------------------------------------------------------------------------------
Dump of local-side certificate information:
--------------------------------------------------------------------------------
(GSKit) Peer not recognized or badly formatted message received.
ssl_error(415): (GSKit) Peer not recognized or badly formatted message received.
SetError() #30: SSL Handshake: (GSKit) Peer not recognized or badly formatted message received.
--------------------------------------------------------------------------------
Dump of server-side certificate information:
--------------------------------------------------------------------------------
Cert Validation Code = 0
(GSKit) An operation which is not valid for the current SSL session state was attempted.
ssl_error(5): (GSKit) An operation which is not valid for the current SSL session state was attempted.
(GSKit) An operation which is not valid for the current SSL session state was attempted.

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