RWordPress knit2wp Unknown SSL protocol error in connection to site.com:443

I am trying to publish a .Rmd file as post on my website which uses WordPress. I get the following error:

Error in function (type, msg, asError = TRUE) : Unknown SSL protocol error in connection to meshry.com:443

I don't know what it means nor what to do about it. Your help will appreciated. Here is my code:

library(knitr)
library(RWordPress)

options(WordpressLogin = c(myusername = "mypassword"),
        WordpressURL = "https://meshry.com/xmlrpc.php")

knit2wp("mypost.RmD" ,
        title = "My Post" ,
        publish = FALSE ,
        action = "newPost")