kerberos port 80 blocked by kaspersky antivirus

  • 27 July 2021
  • 5 replies

We have Kaspersky security center 12 (Kaspersky Endpoint Security for Windows 11.4.0.) and Kaspersky Security Center Network Agent.


Windows Version : Windows Server 2019 Std.


We use Hyper-V replication from primary server to secondary server which uses port 80 Kerberos for replication and both server have kaspersky.


Now from past 3 to 4 days replication automatically stopped and port 80 is not reachable for primary to secondary so after troubleshooting i found that kaspersky is culprit after exit replication is working fine.

I have checked polices “Firewall” policy is already disabled.

5 replies

Userlevel 4
Badge +2

Hi @osama.mansoor,

you don’t say what security product you have installed on the server?


It’s either the KES (https://support.kaspersky.com/kes11) or KSWS (https://support.kaspersky.com/ksws11).


Let us know, so we can assist you more effectively :sunglasses:



Userlevel 2
Badge +1

Greetings osama.mansoor,

Kaspersky doesn't block port 80 by default, so there must be something else causing the problem, and more so, if it was working before.

Since this issue requires some investigation, I would recommend opening a support case at companyaccount.kaspersky.com.

US Support
Working hours: Mon–Fri, 10:00 am – 5:00 pm (ET)
Excluding company holidays


To protect you as our customer, Kaspersky Lab requires any person contacting support to be registered in CompanyAccount. When registering, each person is required to enter a valid company name and contact information.

To register for CompanyAccount, click on the link below:

Once at this site:
• Enter First name, Last name, Company Name, E-mail address.
• Upload a key file (.key) or enter your 20 digit activation code.
• Enter the CAPTCHA code
• Accept the “terms of Privacy Statement.”
• Click "Create now."

Once completed, you will receive an email with instructions on how to access Kaspersky Lab support.

For more details, click on the link below:

http://support.kaspersky.com/faq/companyaccount_help .

Best Regards,

@Jose P its already opened by my colleague


Kaspersky Support INC000013034091

@MilanBortel  its KES

Userlevel 4
Badge +2

@MilanBortel  its KES

Thanks, well.. maybe it’s a good idea to use KSWS instead. This product is tested on servers, more suitable then KES (this is meant to be used on personal OS) :clown:


Anyway, let us know the outcome from support, it is always interesting to see how the troubleshooting worked out :)