FTP traffic denied with Strange behaviour

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FTP traffic denied with Strange behaviour

L4 Transporter

This is my rule:

Rule_post.png

 

The traffic is allowed, however suddenly the traffic will be denied and starts working after some time:

Please refer the logs:

Post_rule.png

The same traffic ( same porta and destination ) which was allowed suddenly denied in firewall.Data lane CPU percentage is below 20% during this time.

its 5050 firewall with 7.1.7 verson. Have any one faced this sitaution 

 

PCNSE-7, ACE-6,ACE 7 , CCNP, CCNA,CCIE(theory) , RHCE
Firewalldog dot com
1 ACCEPTED SOLUTION

Accepted Solutions

L4 Transporter

This seems to like an issue with control link times out before the data link connection happens.

There is a  timeout value for control connection which wait for data link connection. As there are no traffic reported during that time, while waiting for data link.

PCNSE-7, ACE-6,ACE 7 , CCNP, CCNA,CCIE(theory) , RHCE
Firewalldog dot com

View solution in original post

2 REPLIES 2

Cyber Elite
Cyber Elite

you can try setting up a packetcapture for your sessions on port 21 to verify if the data channel information is being negotiated properly and check if corresponding predict sessions are being created to allow these through

 

a flow basic / appid basic could also help figure out if the predict sessions are getting created (if the conrol channel is properly communicating the data channels)

Tom Piens
PANgurus

L4 Transporter

This seems to like an issue with control link times out before the data link connection happens.

There is a  timeout value for control connection which wait for data link connection. As there are no traffic reported during that time, while waiting for data link.

PCNSE-7, ACE-6,ACE 7 , CCNP, CCNA,CCIE(theory) , RHCE
Firewalldog dot com

View solution in original post

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