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  • Cisco WLC does not switch to newly added Radius server

    Troubleshooting and FAQ

    Cisco WLC does not switch to newly added Radius server

    Problem description I came across one of customer’s problem with Cisco WLC wireless controller and 802.1x network. Radius service was driven by NPS (Microsoft Windows Radius). After setup of new NPS server customer configured the second Radius server on WLC swapping the radius server priority (on the first place under the WLAN Security -> Advanced […]

    Date: 13.06.2018

    Author: Marcin Bialy

    Cisco AP can’t join the WLC controller… DTLS handshake failure.

    The problem, network components and topology I recently faced the issue with AP join to vWLC. Cisco 2700 AP could not join to newly installed Cisco vWLC controller. A colleague asked me to take a look and explained the topology. The vWLC was located in Grandmetric DC Testing Labs whereas Cisco CAP-2700 was located at […]

    Date: 30.05.2018

    Author: Marcin Bialy

    IPSec tunnel between Cisco IOS router and AWS VPC. Static VTI and crypto map with HSRP redundancy.

    Recently i was asked to advise in the following scenario: VPN tunnel between AWS VPC and Cisco IOS routers on DC prem. Nothing sophisticated but: Two ISR 4k, HSRP VPN redundancy, legacy crypto maps in production (several working vpns) and Static VTI (AWS). Two Crypto structures sourced from one HSRP. I have put the results on blog.

    Date: 25.04.2018

    Author: Grandmetric

    Troubleshooting FMC and Cisco Firepower Sensor communication

    In this post we are going to focus on the scripts included in FTD and FMC operating systems that help to troubleshoot connections between FTD sensors and Cisco Firepower Management Center. As they are run from the “expert mode” (super user), it is better that you have a deep understanding of any potential impact on […]

    Date: 23.04.2018

    Author: Ivan Radev

    Dealing with Cisco Firepower Management Center (FMC) and Firepower sensor communication. Registration process.

    This post should help you to understand the Firepower sensor registration in Firepower Management Center process and uncover the communication specifics between firepower components. I will also give you some additional hints what to check to verify the registration. In order to make troubleshooting easier there will be dedicated troubleshooting post later on. 1. High […]

    Date: 16.04.2018

    Author: Ivan Radev

    Conflicting protocols specified by tunnel-group and group-policy

    It is my pleasure to write about conflicting protocols in post for the Troubleshooting and FAQ section of our Grandmetric blog. In this category we will publish bugs/issues, problem descriptions, handy troubleshooting techniques as well as answers for interesting questions. As network contractors and trainers, we have come across dozens of interesting problems that have been faced by […]

    Date: 04.12.2016

    Author: Marcin Bialy

    ISE GUI admin password expired

    Hi, it is common situation, that ISE admins are not aware that the initial ISE GUI admin password expires after 45 days after installation. This is the default behavior of ISE. It is worth to be aware of this setting and to remember to uncheck the Administrator Password Expire .. in Password Lifetime section.   You […]

    Date: 15.05.2016

    Author: Marcin Bialy