Error: Failed to connect to api.twitter.com port 443: Connection refused

Hi!
I currently made a new website and got a problem with the connection to my Twitter account.
I registered perfect information of Twitter info, But when submit a test post, this error message coming up.
Version3.6.5

Testing …
Array
(
[pgID] =>
[isPosted] => 0
[pDate] => 2016-07-06 15:46:21
[Error] => Resp: | Error: Failed to connect to api.twitter.com port 443: Connection refused| MSG: Test Post from – 60
)
Array ( [pgID] => [isPosted] => 0 [pDate] => 2016-07-06 15:46:21 [Error] => Resp: | Error: Failed to connect to api.twitter.com port 443: Connection refused| MSG: Test Post from – 60 )

https://wordpress.org/plugins/social-networks-auto-poster-facebook-twitter-g/