What causes the following error (SQLAnywhere 12.0.1.4178):
E. 07/23 17:13:04. The TLS handshake failed, error code 8
?
I note that in a few milliseconds before an error similar request has been successfully executed:

[connid = 26, 07/23 17:13:02.995, REQUEST]
POST /d4w/api/getPeriod HTTP/1.0
Host: ... .com
ASA-Id: 5831d8ab74f348758f1bb69451cbccbf
Accept-Charset: windows-1251, UTF-8, *
Authorization: Basic M...=
Content-Length: 158
Connection: close
Date: Thu, 23 Jul 2015 07:13:03 GMT
User-Agent: SQLAnywhere/12.0.1.4178
Content-Type: application/xml; charset=windows-1251

<slotRequest> ... </slotRequest>
[connid = 26, 07/23 17:13:03.151, RESPONSE]
HTTP/1.1 200 OK
Server: nginx/1.4.6 (Ubuntu)
Date: Thu, 23 Jul 2015 07:13:26 GMT
Content-Type: application/xml;charset=UTF-8
Connection: close
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><response><errorStatus>OK</errorStatus></response>
[connid = 26, socket closed by peer]
[connid = 26, socket closed]

[connid = 26, 07/23 17:13:03.192, REQUEST]
POST /d4w/api/getPeriod HTTP/1.0
Host: ... .com
Accept-Charset: windows-1251, UTF-8, *
Connection: close
Content-Type: application/xml; charset=windows-1251
Date: Thu, 23 Jul 2015 07:13:04 GMT
ASA-Id: 5831d8ab74f348758f1bb69451cbccbf
Content-Length: 158
Authorization: Basic M...=
User-Agent: SQLAnywhere/12.0.1.4178

[connid = 26, Error: socket closed]
[connid = 26, socket closed]
[connid = 26, Error: socket closed by peer]