How to Start Application Proxies in Manage Services on Server

Resolution :

Run the following commands in Sharepoint 2013 Management Shell

$proxy = Get-SPServiceApplicationProxy | where {$_.TypeName -eq “Application Proxy Type Name"}
$proxy.Status = "Online"
$proxy.Update()

For Example : $proxy = Get-SPServiceApplicationProxy | where {$_.TypeName -eq "Secure Store Service Application Proxy"}

Error : Cannot connect to the SharePoint site

Resolution : Make Sure SharePoint Service is running under Services.