Sitecore installation 503 error : digged the mountain and found a rat

I was installing Sitecore 9 update 1 on desktop machine with Windows 10 Enterprise as OS and IIS 10.

At "UpdateSolrSchema : SitecoreUrl" stage, I received this error

[---------------------------------------- UpdateSolrSchema : SitecoreUrl ---------------------------------------------
[UpdateSolrSchema]:[Requesting] habitat.dev.local/.../PopulateManagedSchema.aspx
Install-SitecoreConfiguration : Error requesting habitat.dev.local/.../PopulateManagedSchema.aspx
The remote server returned an error: (503) Server Unavailable.
User Name         habitat\user1
[UpdateSolrSchema]:[Requesting] http://habitat.dev.local/sitecore/admin/PopulateManagedSchema.aspx?indexes=all
Install-SitecoreConfiguration : Error requesting
http://habitat.dev.local/sitecore/admin/PopulateManagedSchema.aspx?indexes=all: The remote server returned an error:
(503) Server Unavailable.
At C:\code\install-xp0.ps1:272 char:9
+         Install-SitecoreConfiguration $SitecoreConfiguration `
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Install-SitecoreConfiguration

When I checked my new Sitecore website were available in IIS, but when I try to run them , I was getting 503 errors.

I googled it find out that its something related with Windows 10 patches.
I tried different solutions suggested by developers like App pool settings, permission, SOLR availability issues but none of them work for me.

Solution:-

My initial doubt  was on Windows 10 Enterprise machine as I done the installations on Windows 10 Professional several time and didn't encountered any issue. After spending several hours Windows 10 Enterprise OS seems to be fine and have all the patches in place.

This machine was running in client office environment. So their IT team using proxy to access internet. This proxy is blocking all local websites to run in browser. When I disabled this, my Sitecore applications started to work.
 
To disabled proxy
Open Internet explorer -> Goto Tools Menu -> Select Internet Options -> Click Connections Tab -> Click on LAN Settings Button -> Disabled checkbox of Proxy 
server section.

Proxy Settings in Internet Explorer

I spend 2 days to figure out this issue. I dug up the mountain and all I could find was a dead rat.

I hope this tip will help somebody to resolve similar issue.