I recently had problems using my Yubikey GPG key to SSH from my WSL instance to a linux server. After the usual checks, it seemed like it was a client side error sign_and_send_pubkey: signing failed for RSA "/home/user/.ssh/id_rsa" from agent: agent refused operation. Most people on the ...

I had some issues with automatically creating a service principal to set up Azure Resource Manager in Azure DevOps due to overly strict Azure AD policies resulting in the following error Error encountered: Failed to create an app in Azure Active Directory. Error: Credential lifetime exceeds the ...

There are a number of sites out there mentioning that macvlan has a limitation when used with docker or lxc containers. The host machine will not be able to communicate with the guest machine and vice versa. While this is true by default, there is a tweak that you can perform to make host guest ...

This is a topic that is not commonly discussed. Most articles about IP hijacking deal with the subject at the ISP level, i.e. hijacking of BGP protocol. However, IP hijacking can be performed on the LAN as well. It is possible to use static routes at the gateway to route a public IP address to ...

I recently decided to migrate my server cluster's logging mechanism from rsyslog to Splunk. My previous setup was to use rsyslog to centralise all logging onto /var/remotelog/ on a central server. I then configured the Splunk indexer to index both /var/log/ as well as /var/remotelog/, this ...

Enumerating sites which are hosted on the same IP address can sometimes tell us a lot about a server. Is it shared hosting? Is it a legitimate server which was compromised for C2 operations? Does the site owner have any other shady business dealings on the side? I am aware that there are sites ...

For the uninitiated, UVB-76 is a station that broadcasts coded messages over AM radio. It is still active with messages transmitted as recently as Oct 2016 and is speculated to be related to the Russian military. The transmission and tone generation equipment are from the analog era, hence I ...

It is relatively easy to hide the IP address of clients through the use of VPNs and proxies. However, it is a challenge for services since they need to be reachable by the clients. Imagine if your phone number changed at the stroke of midnight everyday, it would be very difficult for others to ...