I have two Amazon EC2 Instances running Windows Server 2003 and IIS 6.0. Both the instances are created in the same region and have the same Security Group. I enables icmp for all ports and connection methods, and am able to successfully ping between both my instances. However, when I try to access the shared locations of one EC2 instance feom another, using:




I am unable to see the shared locations, and get an error saying:

No Network Provider accepted the given network path

I am able to trace from both EC2 instances using the tracert command.

Please let me know of a way to accessed shared locations between two EC2 instances.


P.S.: I know that this can alternatively be achieved using S3, but do not wish to use it for different reasons.

migrated from stackoverflow.com Sep 23 '11 at 17:52

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  • Belongs on serverfault, I think – bdonlan Jan 29 '11 at 11:38
  • I agree with @bdonlan, this should be on serverfault. – qxotk Sep 22 '11 at 13:58

I found the answer to my own query, and here it is:


This can be found at this Microsoft knowledgebase article which deals with the ways to enable Microsoft file sharing SMB. The below matter is of relevance:

The following ports are associated with file sharing and server message block (SMB) communications:

  • Microsoft file sharing SMB: User Datagram Protocol (UDP) ports from 135 through 139 and Transmission Control Protocol (TCP) ports from 135 through 139.
  • Direct-hosted SMB traffic without a network basic input/output system (NetBIOS): port 445 (TCP and UPD).

How to do it:

  1. Enable the above ports in the security group associated with your EC2 Instance. Once you have done this, your Security Group Permissions should look something like the image below: EC2 Security Group Permissions

  2. Enable the ports in the windows firewalls of both the instances. A detailed method to do so can be found here. Skip step 7 for Windows Server.

This solves the issue, however, a restart of the instances might be needed.

  • Verified. Need to enable "Windows File Sharing" in firewall config if you use Windows firewall. Also, for this to work, you need to explicitly share a folder to the other machine. – djangofan Aug 15 '11 at 21:23

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