Increase an Ubuntu VM disk size on a Proxmox host live

Step one is to update the disk size for the VM. This is easily done in the GUI. Select your VM on the left, click on “Hardware,” choose the virtual disk you want to resize, and then select the “Disk Action” menu from the top. From here select “Resize” as per the below: This should […]

Shimo can connect, but does not pass traffic after a while

I cam across this on macOS 13.5 (Ventura). Basically Shimo would connect, but then it could not pass any traffic. A reboot fixed it every time, but was painful at times. First thing I did was check the Preferences and enable “Reset Network Configuration when Shimo is terminated” under the Advanced tab. That and pushing […]

mailcow: Confirmed A record with IP xxx.xxx.xxx.xxx, but HTTP validation failed

Found this happening in my new mailcow installation and could reproduce following the steps here https://docs.mailcow.email/post_installation/firststeps-ssl/#lets-encrypt-out-of-the-box to re-run the ACME plugin. Found lots of others complaining about this and recommendations to disable IP and HTTP checks. Don’t do that! Instead fix your NAT reflection rules so that your containers can talk to your external IP […]

Changing USG-3P WAN static IP aka “There was an error saving the Primary (WAN1) network. IP xxx.xxx.xxx.xxx is used as NAT outband at configuration Default.”

Not sure why this is an issue that Ubiquiti has left out there, but if you try and change the static IP address the UniFi controller will puke with the above error. Apparently there are a bunch of different workarounds, but the simplest (to me at least) seems to be logging into the USG directly […]

Don’t be a fuckup; fuckup (that’s not where check_sender_access goes!)

So recently some Russian cunt(s) started relaying email through my postfix server. I finally figured out I had a check_sender_access in my smtpd_helo_restrictions AND smtpd_sender_restrictions. With entire domains listed spammers found one of the domains to send from and then used my server as an open relay. -Don’t put entire domains in sender_access as OK. […]