Recently, I had to troubleshoot an issue where users moving between floors with different subnets/vlans were not getting the correct LAN IP address (i.e. first floor was 192.168.1.0/24 and second was 192.168.2.0/24). Verified the network devices had IP Helpers, even temporarily disabled DHCP failover (2012R2+ feature) to rule that out - nothing. Whenever the machine … Continue reading Why you should never use Microsoft DHCP SuperScopes
Author: Michael Martin
IT Consultant - Infrastructure and Security
Browser SSL/TLS Errors with no Error Codes
I have quite often run into issues with clients where they certain web applications no longer work after a Firewall Migration or implementation of Web Proxies (such as BlueCoat). The scope of the issue tended to be the webUI mgmt interfaces of our various network and server devices - i.e. Aruba, Nutanix, NetApp, HP iLo, … Continue reading Browser SSL/TLS Errors with no Error Codes
NETLOGON ERRORS DUE TO RPC MISMATCH BETWEEN WINDOWS CLIENTS AND DOMAIN CONTROLLERS
Recently, I had a client who had a relatively fresh AD environment as a result of a divestiture, however, they had stood up their domain controllers at different time periods during the environment build out. As such, their DC's each had different hardening settings depending on which build they used (and what levels of hardening … Continue reading NETLOGON ERRORS DUE TO RPC MISMATCH BETWEEN WINDOWS CLIENTS AND DOMAIN CONTROLLERS
Never A Null Moment 