I helped someone to troubleshoot an annoying issue he was facing when using an Excel Add-In.
The Add-In is consuming a webservice on a remote server. The following is the error he got when he tried to logon using the Add-In.
He told me that he has to bypass proxy server in order to make it works. However, if he bypass proxy server, he cannot access Internet. So it is annoying because he needs to toggle between having proxy settings and no proxy settings.
