Here’s a write up for https://tryhackme.com/room/templates Recon After starting up the machine, as per instruction there’s a website running on port 5000. In my case: http://10.10.33.8:5000/ Click on the Convert to HTML button, it’ll convert the template to HTML. To make it easier to visualize the request, I replaced the…

This turns out to be my command line error. The arguments of docker run need to follow the right order. i.e. This will ignore the port mapping: docker run 09dad155f3cc -d -p 8080:8080/tcp and this will work as expected: docker run -p 8080:8080/tcp 09dad155f3cc -d

When building a Dockerfile from my MacBook: > docker build . Sending build context to Docker daemon 123kB Step 1/8 : FROM debian:jessie jessie: Pulling from library/debian no matching manifest for linux/arm64/v8 in the manifest list entries A quick search of the error “no matching manifest for linux/arm64/v8 in the manifest list entries” indicates it has to do with Apple M1 Chip. Workaround Pull the image with the platform specified:

In sshd_config, there’s a configuration parameter for MaxStartups. The man page: MaxStartups Specifies the maximum number of concurrent unauthenticated connections to the SSH daemon. Additional connections will be dropped until authentication succeeds or the LoginGraceTime expires for a connection. The default is 10:30:100. Alternatively, random early drop can be enabled…

Below is my ‘quick fix’ (bandaid) solution to the following errors/exceptions. The errors Error: Execution of '/usr/bin/gem install --no-rdoc --no-ri cowsay' returned 1: ERROR: While executing gem ... (OptionParser::InvalidOption) invalid option: --no-rdoc Did you mean? no-force A reference article https://github.com/puphpet/puphpet/issues/2838 The ‘quick fix’ W.r.t. the reference article, I searched for the file ‘gem.rb’. Since ‘locate’ was not installed in the OS, I used the ‘find’ command to look for the file:

Continued from the previous post. As I am making full use of my 30-days free account in Azure, I have setup a pair of Puppet servers to test (with respect to the reference article at the bottom). A problem In the Puppet master, I have: /etc/puppet/manifests/site.pp with content file {'/tmp/example-ip'…

I have just started using Azure cloud. As a frugal engineer, I will make full use of the 30 days free tier. As I added more VMs to my free account, it finally hit the limit. On the Virtual Machines page, I could not find a button to downsize the ones I already created (even if I power the VM down). So I started deleting them to free up the limit. But the following error persisted, even after I deleted every VM/refreshed the page:

Lately I have tested Protectli Vault (with both OPNsense and pfSense). Below are some tips/takeaways. Protectli Vault The model I tested was FW6D — 6 Port Intel® i5. Protectli Vault - 6 Port Ports, power, customization: Meet the 6-Port Vaults, ideal for businesses and complex networks: Intel 3867U, i3-7020U…protectli.com Why Protectli Due to some physical constraints (of the place where my ISP placed the cable), I need a firewall without a lot of fan noise…

Graylog is a great tool to visualize and analyze what’s happening to your backend systems. Production log files are usually too noisy for human eyes, i.e. a tail -f on the log will show you the influx of new entries which are impossible for human eyes to catch. Moreover, logs…