My posts about issues concerning Linux OS and network administration

ASA 5000 series

Annoying Cisco ASA bug in IOS 8.4.5 and 8.4.6 – ERROR: NAT Policy is not downloaded

Posted on:
Thursday, August 29th, 2013
Author:
Tomas Brandysky

It’s been already few month when we upgraded ASA box to 8.4.6 IOS version. I needed to add new NAT rules and ended up with error “ERROR: NAT Policy is not downloaded”. After contacting local Cisco support I was told this is a known issue and the workaround is to remove all NAT configuration and […]

Posted in ASA 5000 series, Cisco devices configuration | No Comments »

Configuring NSEL (Netflow Secure Event Logging) with Cisco ASA and Centos 6 server

Posted on:
Friday, March 8th, 2013
Author:
Tomas Brandysky

These are the steps we need to do to make everything work together: Enable NetFlow feature on ASA box Install nfdump and nfsen software to collect the data from ASA Install and configure web server (eg. Apache) to make the graphs accessible via web browser 1. ASA setup ASA 5000 series comes with NetFlow version […]

Posted in ASA 5000 series, Cisco devices configuration, network administration software, Network Topology | No Comments »

Cisco ASA 55xx and ESMTP inspection breaks TLS

Posted on:
Monday, October 31st, 2011
Author:
Tomas Brandysky

It’s been few days when we discovered a problem with sending emails using TLS in our company. We found out the problem with sending emails via TLS was the result given by the email server after “STARTTLS” command: > 502 5.5.2 Error: command not recognized First it seemed as the destined server didn’t implement TLS […]

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Bad Behavior has blocked 83 access attempts in the last 7 days.