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

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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.

1 REPLY 1

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

Thanks

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