Outlook and proxy PAC file

Using Outlook 2010 SP2 connecting to Exchange 2013 SP 1 with a PAC file (configured under Internet Options).  When the PAC file is not available, Outlook fails to connect to Exchange initially, upon hitting the retry button (on server unavailable
message), it connects just fine.  Not sure if this has to do with Outlook Anywhere or Outlook application in general, but it looks as if it does not fail open cleanly (like IE for example).  Is there a way to tell Outlook to connect to Exchange by
ignoring/bypassing the system wide proxy config from Internet Options?  I want to ensure that if the PAC file is not available to Outlook, it connects to Exchange without issues.

Thank you for the update.
I am trying to involve someone familiar with this topic to further look at this issue. There might be some time delay. Appreciate your patience.
Thank you for your understanding and support.
Steve Fan
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