Update virtual-network-troubleshoot-connectivity-problem-between-vms.md

If user has NSGs on both levels, then both have to be configured. Also, this is one of the questions asked in Azure Administrator Certification exam. So I would suggest to add the following for clarity:

"You may have to add inbound rules on both NSGs: at subnet level and virtual machine's interface level."

Author: azarboon

articles/virtual-network/virtual-network-troubleshoot-connectivity-problem-between-vms.md

@@ -56,7 +56,7 @@ For more information, see [Add network interfaces to or remove from virtual mach
 
 ### Step 2: Check whether network traffic is blocked by NSG or UDR
 
-Use [Network Watcher IP Flow Verify](../network-watcher/network-watcher-ip-flow-verify-overview.md) and [Connection troubleshoot](../network-watcher/network-watcher-connectivity-overview.md) to determine whether there's a Network Security Group (NSG) or User-Defined Route (UDR) that is interfering with traffic flow.
+Use [Network Watcher IP Flow Verify](../network-watcher/network-watcher-ip-flow-verify-overview.md) and [Connection troubleshoot](../network-watcher/network-watcher-connectivity-overview.md) to determine whether there's a Network Security Group (NSG) or User-Defined Route (UDR) that is interfering with traffic flow. You may have to add inbound rules on both NSGs: at subnet level and virtual machine's interface level.
 
 ### Step 3: Check whether network traffic is blocked by VM firewall
 
@@ -103,4 +103,4 @@ If you can't connect to a VM network share, the problem may be caused by unavail
 Use [Network Watcher IP Flow Verify](../network-watcher/network-watcher-ip-flow-verify-overview.md) and [NSG Flow Logging](../network-watcher/network-watcher-nsg-flow-logging-overview.md) to determine whether there's an NSG or UDR that is interfering with traffic flow. You can also verify your Inter-VNet configuration [here](https://support.microsoft.com/en-us/help/4032151/configuring-and-validating-vnet-or-vpn-connections).
 
 ### Need help? Contact support.
-If you still need help, [contact support](https://portal.azure.com/?#blade/Microsoft_Azure_Support/HelpAndSupportBlade) to get your issue resolved quickly.
+If you still need help, [contact support](https://portal.azure.com/?#blade/Microsoft_Azure_Support/HelpAndSupportBlade) to get your issue resolved quickly.