TCP 135 traffic coming from firewall IP to internet ip's?

Showing results for 
Show  only  | Search instead for 
Did you mean: 
Please sign in to see details of an important advisory in our Customer Advisories area.

TCP 135 traffic coming from firewall IP to internet ip's?

L2 Linker

We received notice from our ISP of flagged traffic coming from our firewall's internal ip address to many internet ip's via tcp 135. User ID is turned off on the public facing security zones. We are on PanOS 6.0.0

Anyone else seen this? I set a security policy blocking internet bound tcp 135 traffic from our firewall's management ip. Odd stuff.


L7 Applicator

Hello Sir,

Port 135 is for netbios. This will happen when user identification is enabled on the Untrust zone and the option to perform WMI/NetBios probing is enabled.

Please find below mentioned discussion for more information.

Firewall Sending NetBios Probe Packets from the Public Interface

firewall IP

Management Interface Traffic to Port 135

Re: strange connection from PA - help me please


  • 1 replies
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!