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Endpoint Security is blocking Hyper-V network connectivity

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Hi all.

I need help on configuring Endpoint Security (10.6) with an HyperV vEthernet virtual switch.

It seems like Endpoint Security firewall is blocking Hyper-V network connectivity, I can't even connect to the guest machine via Virtual Machine Management service (vmms.exe, port 2179).

I added a new rule on firewall defined as:

Allow all network traffic, any protocol, local subnet 172.25.99.145/28.

And now I can connect to the guest machine and manage it but the guest machine can't connect to external networks because firewall blocks incoming and outcoming traffic throught the internet.

Currently I am using the default vEthernet virtual switch configured with 172.25.99.145/28 network and the only way I found to fix completely this issue was to add a new rule defined as:

Allow all network traffic, any protocol.

Can you help me to fix this?

Thanks.

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McAfee Employee
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Message 2 of 2

Re: Endpoint Security is blocking Hyper-V network connectivity

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Hi @Gabbo,

Thank you for your post! I would first begin from the Firewall Activity monitor logs to understand what rule is blocking your attempt to connect to internet. if an allow all rule is able to resolve/work around your problem, we can safely assume this can be resolved with configuration of a rule specific to the block we are facing.

if the rule that is blocking your traffic is a Block all rule, then we need to understand that this is the default behavior and we need to create a rule specifically to allow this connection. if this is a specific block rule causing the issue, exclusion or modification to that rule should do.

the easiest way to figure out would be to use Firewall in adaptive mode where you get to now from the logs what rules are required to be present in order to allow proper working of the machine.

More information here:

https://docs.mcafee.com/bundle/endpoint-security-10.6.0-firewall-product-guide-windows/page/GUID-101...

https://docs.mcafee.com/bundle/endpoint-security-10.6.0-firewall-product-guide-windows/page/GUID-0DD...

I sincerely hope this gives you a good start.

If you want this to be done by us, Please create a Service Request with us and feel free to reference my name if you are available during the Middle-Eastern Time so that I can pick this one up and work with you towards a resolution.

Was my reply helpful?
If you find this post useful, Please give it a Kudos! Also, Please don't forget to select "Accept as a solution" if this reply resolves your query!

Thanks and regards,
Adithyan T

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McAfee Employee
McAfee Employee
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Message 2 of 2

Re: Endpoint Security is blocking Hyper-V network connectivity

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Hi @Gabbo,

Thank you for your post! I would first begin from the Firewall Activity monitor logs to understand what rule is blocking your attempt to connect to internet. if an allow all rule is able to resolve/work around your problem, we can safely assume this can be resolved with configuration of a rule specific to the block we are facing.

if the rule that is blocking your traffic is a Block all rule, then we need to understand that this is the default behavior and we need to create a rule specifically to allow this connection. if this is a specific block rule causing the issue, exclusion or modification to that rule should do.

the easiest way to figure out would be to use Firewall in adaptive mode where you get to now from the logs what rules are required to be present in order to allow proper working of the machine.

More information here:

https://docs.mcafee.com/bundle/endpoint-security-10.6.0-firewall-product-guide-windows/page/GUID-101...

https://docs.mcafee.com/bundle/endpoint-security-10.6.0-firewall-product-guide-windows/page/GUID-0DD...

I sincerely hope this gives you a good start.

If you want this to be done by us, Please create a Service Request with us and feel free to reference my name if you are available during the Middle-Eastern Time so that I can pick this one up and work with you towards a resolution.

Was my reply helpful?
If you find this post useful, Please give it a Kudos! Also, Please don't forget to select "Accept as a solution" if this reply resolves your query!

Thanks and regards,
Adithyan T

View solution in original post

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