Could not call service background error [#2726937]

I have bunch of background jobs for running various reports by fetching data from database and writing onto file. while batch job is initiated bunch of below errors are logged in watchdog.

I have checked ssl cert and service from host is also accesable. I have recently upgraded drupal 7 core from 35 to 43.
Any help /suggestions around the issue is more appriciated

Could not call service background_batch:11076 for callback _background_batch_process: stdClass Object ( [url] => https://localhost/bgp-start/background_batch%253A11076/3f1f608150798e829... [options] => Array ( [method] => POST [headers] => Array ( [Authorization] => [User-Agent] => Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0 [Accept] => application/json, text/javascript, */*; q=0.01 [Accept-Language] => en-US,en;q=0.5 [X-Requested-With] => XMLHttpRequest [Referer] => https://localhost/batch?op=start&id=11076 [Cookie] => biauth=IavtgOa62wgrnjJxLoab+3IVqnydeLgiNVQmZK4y0V6Tc3tPZKBVat6H3zYblMzaICGnhxpSzydCpBNooBmGT5wAYZzZZHP8tSMnhA3C+jvHLElLybEjA6vzl2C0BLRf; AMCV_16AD4362526701720A490D45%40AdobeOrg=1256414278%7CMCMID%7C49001150562072617433533025803548290065%7CMCAAMLH-1441131445%7C7%7CMCAAMB-1441131445%7CcIBAx_aQzFEHcPoEv0GwcQ%7CMCAID%7CNONE; __gads=ID=9de38b006fe00e6d:T=1440526645:S=ALNI_MaUN4EHV0IaRAPSFW31skxAyWTivw; _ga=GA1.2.1824877881.1440684943; Drupal.tableDrag.showWeight=0; has_js=1; _gat=1; SESS017bd53270e4c5a5f2097168d75b1ee7=0oMyxtM1WNTOwnx-jD-RYurqYqwASbI5w4xlrd-_Jp4; Drupal_visitor_first_login=1 [Pragma] => no-cache [Cache-Control] => no-cache [X-Medis-Https] => true [Client-Ip] => XXXXX [Host] => localhost:80 [Connection] => close ) [data] => [max_redirects] => 3 [timeout] => 2 [context] => [blocking] => [postpone] => ) [code] => 0 [uri] => Array ( [scheme] => https [host] => localhost [path] => /bgp-start/background_batch%253A11076/3f1f608150798e8293a16c3cf2bd9b21 ) [socket] => ssl://localhost:443 [postponed] => [start] => 1463432229.3997 [data_ready] => 1 [error] => Error opening socket ssl://localhost:443 [end] => 1463432229.4211 )

Thanks in advance