Patch Download Failure - "Error 403" or "Unknown Host Exception"


You are trying to download patches of Microsoft/other vendors. However Patch download fails with error message: "Error Code 403 or Unknown Host Exception".


Error code 403 occurs when the web server is not reachable or access to the server has been denied. This might happen due to various reasons such as, forbidden access, or connectivity issues.


Ensure that the configured Proxy settings has permission to download the installabe files from the below mentioned websites




Retry the process of downloading the patch from the vendors website.

In case if this problem continues, kindly Contact Support

Keywords: Patch Management, Deploy Patches, Configure Patch Installation, Download Patches

Unable to resolve this issue?

 * Mandatory Fields

Other KB articles 24/5 Support

Support will be available 24hrs a day and five days a week (Monday through Friday), excluding USA & India public holidays.

Tel : +1-888-720-9500
Email :

Speak to us

  • Join the Endpoint Central Community, to get instant answers for your queries, register with our Forum.
  • Look out for the latest happenings in Desktop Management, follow our Tweets on Twitter.
  • Get to know the latest updates and Best Practices in Desktop Management through our Blog.