WebVPN client SFR module removes the http packets

Hi, I have configured the WEBVPN access to ASA 5512 with SFR module a long time ago and internal http links have been working great.

After the ASA upgrade to 9.5 (2), module of firepower to 6.0.0 - 1005 and DefenseCentar to 6.0.0 (build 1005), I am unable to open the internal http links (also CIFS works very well at the same time).

After I connect to the WEBVPN, try to open "http://192.168.4.3" and then go to the monitoring of the ASA, I see these newspapers:

6 August 5, 2016 19:11:32 302014 192.168.4.3 80 172.16.1.2 13215 connection disassembly of the TCP 5709589 for Internal:192.168.4.3/80 to identity:172.16.1.2/13215 duration 0:00:21 bytes 0 TCP Reset-O
4 5 August 2016 19:11:19 434002 SFR asked identity:172.16.1.2/13215 to Internal:192.168.4.3/80 TCP packet reduction
4 5 August 2016 19:11:19 434002 SFR asked identity:172.16.1.2/13215 to Internal:192.168.4.3/80 TCP packet reduction
4 5 August 2016 19:11:13 434002 SFR asked identity:172.16.1.2/13215 to Internal:192.168.4.3/80 TCP packet reduction
4 5 August 2016 19:11:13 434002 SFR asked identity:172.16.1.2/13215 to Internal:192.168.4.3/80 TCP packet reduction
4 5 August 2016 19:11:10 434002 SFR asked identity:172.16.1.2/13215 to Internal:192.168.4.3/80 TCP packet reduction
4 5 August 2016 19:11:10 434002 SFR asked identity:172.16.1.2/13215 to Internal:192.168.4.3/80 TCP packet reduction
6 August 5, 2016 19:11:10 302013 172.16.1.2 13215 192.168.4.3 80 built-in TCP outgoing connection 5709589 for Internal:192.168.4.3/80 (192.168.4.3/80) at identity:172.16.1.2/13215 (172.16.1.2/13215)

172.16.1.2 is internal IP address of the ASA and 192.168.4.3 is the internal web server.

If I stop with forwarding traffic to the SFR module all work very well. I checked on DefenseCenter access policy, traffic is allowed I can see in the connection events.

Have no idea what might be a problem here?

Y at - it a debugging option more detailed why SFR removes these packages?

Thank you!

Hi Nele,

I think you might be hitting a bug.

I understand that you have an authorization for this traffic rule. But can you please create a rule to trust the IP address of the ASA for internal services that should be available in your access control strategy.

Now, check if the traffic still gets deleted.

Thank you

Guillaume

Rate if this can help.

Tags: Cisco Security

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