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Jagadeesh AngadiJagadeesh Angadi 

External system unable to login to SFDC using connected app details

External system(RoR) trying to login to SFDC using connected app(username, Password, Client Id and client secret), but they are getting error saying that “Failed to open TCP connection to instance.salesforce.com:443 (No route to host - connect(2) for "instance.salesforce.com" port 443)“

Is this salesforce error? If yes, why salesforce is not allowing connection?