fixing link

Author: George Wallace

articles/virtual-machines/extensions/custom-script-linuxOstc.md

@@ -55,7 +55,7 @@ You can use the extension to use your Azure Blob storage credentials, to access
 
 ### Internet Connectivity
 
-If you need to download a script externally such as GitHub or Azure Storage, then additional firewall/Network Security Group ports need to be opened. For example if your script is located in Azure Storage, you can allow access using Azure NSG Service Tags for [Storage](../../virtual-network/security-overview#service-tags).
+If you need to download a script externally such as GitHub or Azure Storage, then additional firewall/Network Security Group ports need to be opened. For example if your script is located in Azure Storage, you can allow access using Azure NSG Service Tags for [Storage](../../virtual-network/security-overview.md#service-tags).
 
 If your script is on a local server, then you may still need additional firewall/Network Security Group ports need to be opened.