curl is enabled and loaded this is part php.ini.....
...
; Windows Extensions
; Note that ODBC support is built in, so no dll is needed for it.
; Note that many DLL files are located in the extensions/ (PHP 4) ext/ (PHP 5+)
; extension folders as well as the separate PECL DLL download (PHP 5+).
; Be sure to appropriately set the extension_dir directive.
;
;extension=php_bz2.dll
extension=php_curl.dll
extension=php_fileinfo.dll
;extension=php_ftp.dll
extension=php_gd2.dll
extension=php_gettext.dll
;extension=php_gmp.dll
;extension=php_intl.dll
;extension=php_imap.dll
extension=php_interbase.dll
;extension=php_ldap.dll
;extension=php_mbstring.dll
;extension=php_exif.dll ; Must be after mbstring as it depends on it
extension=php_mysqli.dll
;extension=php_oci8_12c.dll ; Use with Oracle Database 12c Instant Client
extension=php_openssl.dll
extension=php_pdo_firebird.dll
;extension=php_pdo_mysql.dll
;extension=php_pdo_oci.dll
;extension=php_pdo_odbc.dll
;extension=php_pdo_pgsql.dll
;extension=php_pdo_sqlite.dll
;extension=php_pgsql.dll
;extension=php_shmop.dll

; The MIBS data available in the PHP distribution must be installed.
; See www.php.net/manual/en/snmp.installation.php
;extension=php_snmp.dll

;extension=php_soap.dll
extension=php_sockets.dll
;extension=php_sqlite3.dll
;extension=php_tidy.dll
;extension=php_xmlrpc.dll
;extension=php_xsl.dll

After reinstall all server when i trying to access the CB Configuration, I get the following error:

Argument 2 passed to GuzzleHttp\Adapter\StreamAdapter::createResponseObject() must be of the type array, null given, called in /var/www/joomla/cav/libraries/CBLib/GuzzleHttp/Adapter/StreamAdapter.php on line 67


after i try

IN: libraries/CBLib/GuzzleHttp/Adapter/StreamAdapter.php
ON: Line 62
FROM:
$stream = $this->createStream($request, $http_response_header);
TO:
$http_response_header = array();
$stream = $this->createStream($request, $http_response_header);

.... my problem with CBconnect is solved... Great

BUT when i want open Comunity Builder any plugin i get

Notice: Undefined offset: 1 in C:\Apache24\htdocs\verbis\libraries\CBLib\GuzzleHttp\Adapter\StreamAdapter.php on line 86
Notice: Uninitialized string offset: 0 in C:\Apache24\htdocs\verbis\libraries\CBLib\GuzzleHttp\Subscriber\HttpError.php on line 30

I have PHP 7.1.8 V14 (i tested with 7.0.22 ...same result) . and Apache 2.4 64 V14. Latest Joomla 3.6.5

without change StreamAdapter.php i get when i try link facebook with any account in Joomla
Argument 2 passed to GuzzleHttp\Adapter\StreamAdapter::createResponseObject() must be of the type array, null given, called in C:\Apache24\htdocs\verbis\libraries\CBLib\GuzzleHttp\Adapter\StreamAdapter.php on line 67


I thing that you are not tested Community Builder for PHP 7 enough

I reinstall PHP and Apache 24 to 2.4 32 V11 and PHP 5.6 V11 and CB Connect is OK without modify StreamAdapter