Step-4: In this step, you have to delete the 4 register files, namely Proxy Override, Proxy Enable, Proxy Server, and Migrate Proxy. After these files get deleted, you …

How to fix "unable to connect to proxy server" error | Tom Jan 02, 2016 Fix: Unable to connect to Proxy Server in Windows 10 Jan 21, 2020

Jan 28, 2014

Jan 02, 2016

Could not connect to lockdownd, error code -21. Exiting

There is a problem with the proxy server's security certificate, %s. Outlook is unable to connect to this server. (%s)