BitDefender Firewall Feature breaks Hyper-V Switch

kiyomaka · 2022-06-06T21:06:40+00:00

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Greetings, no matter what I've done, I've been unable to get Bitdefender to work with the Default Hyper-V (Or any other "Private" Hyper-V) Switch for that matter.

I've had to disable the product's firewall.

Bridging the connection works, however this is ill suited for cases where I need to do large file transfers between the VM and Host.

I had once contacted support about this many months ago but didn't really get anywhere and ended up giving up due to frustration.

Currently using Total Security 26.0.16.69

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Flexx

https://community.bitdefender.com/en/discussion/92053/bitdefender-firewall-feature-breaks-hyper-v-switch

The issue can only be resolved by support team and maybe it will have to be shared with the bitdefender developers.

Generate bitdefender support tool logs (https://www.bitdefender.com/consumer/support/answer/1733/)

Generate bitdefender connectivity logs (https://www.bitdefender.com/consumer/support/answer/9689/)

Share the logs & your query with bitdefender support team by dropping them an email at bitsy@bitdefender.com

The support team will reply back to your query within next 24-48 hours excluding weekends.

Regards

kiyomaka

Hmm, I was hoping I would be able to avoid that but doesn't sound like it. I don't feel that I've had great success with bitdefender support in the past and find myself reluctant to open a support ticket due to the time zone difference and I currently have limited free time.

Flexx

https://community.bitdefender.com/en/discussion/comment/311126#Comment_311126

@Alexandru_BD, @Mike_BD - Kindly check on this.

Regards

Alexandru_BD

Hello @kiyomaka and welcome to the Community!

Try to create a rule to allow on port 135 in Bitdefender firewall.

For more context regarding the firewall, check the following articles:

https://www.bitdefender.com/consumer/support/answer/2082/

https://www.bitdefender.com/consumer/support/answer/13425/

If the rule doesn't solve the issue, it will be necessary to get in touch with the Support teams for further investigation.

Let us know how it goes.

Regards

kiyomaka

elieve I figured out the issue, Bitdefender appears to be breaking the NAT adapter within Hyper-V by dropping the DHCP request packet, such as the one below.

This specific packet was sent from a VM trying to obtain an IP Address

81 13.698982 0.0.0.0 255.255.255.255 DHCP 356 DHCP Request - Transaction ID 0xadba0e9b

I was able to resolve the issue by creating a rule as follows.

All Applications

Network: Home/Office

Proto: UDP

Direction: Inbound

Local IP: 255.255.255.255

Local Port: 67

Remote IP: 0.0.0.0

Remote Port: 68

Is there perhaps a way to apply this rule to the Hyper-V Daemon/Network service itself opposed to a global host level rule?

Alexandru_BD

There might be a way to apply the rule, but only if you can find the service of that Hyper-V in the firewall rules list..

Our engineers can take a look, if necessary. Should you require their assistance, you can get in touch with the Support Teams by choosing one of the contact methods available here:

https://www.bitdefender.com/consumer/support/

Regards