Why can I SSH into a server that won’t respond to ping?
I'm connecting from my laptop to another computer on my network using the same hostname for both tests. At first everything works normally, but then some operations—such as…
firewall
Why can I SSH into a server when ping shows 100% packet loss?
I can connect to my server over SSH using its hostname, but pinging that same hostname reports 100% packet loss. The server initially seems accessible, but some operations—such…
Apache Page Works on My Laptop but Not on My Phone
I added some text to my index.html file after starting Apache. The updated page loads correctly in my laptop's browser, but it does not open when I try…
Apache page works on my laptop but not on my phone
I added some text to my index.html file after starting Apache. The updated page loads normally in my laptop's browser, but it won't open when I try to…
One Windows 11 PC Won’t Accept RDP on a Custom Port
I installed fresh copies of Windows 11 Pro on three Lenovo ThinkCentre Tiny computers. They are configured similarly: private network profile, network discovery and file sharing enabled, fixed…
What caused the American Airlines systems outage?
American Airlines experienced a major systems outage that disrupted operations. Reports indicated that passengers had trouble accessing boarding passes, while airport agents were unable to print them or…
Can I Add or Upgrade the Firewall on My Home Router?
I want to improve the security of my home Wi-Fi and was wondering whether it's possible to install a firewall on a home router, or add stronger firewall…
Miracast Won’t Connect on Dell Pro 16 Laptops
I'm setting up a replacement Dell Pro 16 laptop for an HR user who needs to use wireless displays during meetings. Miracast works normally on some older Dell…
Why does Test-NetConnection hang while ping and quiet mode succeed?
I'm troubleshooting a PowerShell connectivity issue. Running Test-Connection $server succeeds, and Test-NetConnection $server -Port $Port -InformationLevel Quiet also returns a successful result. However, the normal Test-NetConnection $server -Port…
Why Do My ICMP Pings Stop Working When I Change Destination Ports?
I'm trying to understand why my ICMP pings are not working as expected. I have a firewall rule that allows communication between all my internal LANs over all…
Why do my pings stop working when I set specific destination ports?
I'm having some trouble with my firewall configuration. I have a rule that allows all of my internal networks to communicate over any ports and protocols, which works…
Trouble Connecting New On-Prem VLAN to Azure VPN Tunnel
I've successfully set up a VPN tunnel between my on-premises site and Azure for a while now, and I can connect to a VM in Azure without any…
How to Properly Manage DNS Settings on a Server with a New Firewall?
I'm currently working with a client that I've taken over, and they have a bit of a complex setup inherited from a previous company. They have an aging…
Understanding Layer-3 Switches and Routing with Unifi
I'm new to IT and trying to wrap my head around setting up multiple subnets with my Unifi Cloud Key and a Layer-2 switch at one location. I…
Resolving Windows Firewall Pop-up Issues with VPN and Domain Settings
I've been dealing with a strange issue on my Entra AP devices where users report getting a pop-up asking if they want to allow an app through the…
Why Can't I Access Azure AVD Behind a Firewall?
I've set up Azure Virtual Desktop (AVD), and it works perfectly fine when the traffic is routed directly to the internet. Users can log in using their EntraID…
How to Optimize Firewall and Access Point Setup with ISP ONT?
I've recently transitioned to a sys admin role and have been tasked with setting up our infrastructure from scratch, which has been an exciting learning opportunity! Before this,…
Recommendations for the Best Enterprise Hybrid Mesh Firewall
I'm on the lookout for some solid recommendations on hybrid mesh firewalls suitable for enterprise-level deployments. Our organization is dealing with a multi-cloud setup, and we need a…
What security measures should I take after installing Ubuntu?
I just upgraded to Ubuntu 24.04 after moving away from Windows 11, and I'm really new to Linux. I'm looking for advice on how to enhance my security…
Understanding Docker's Firewall Warning
I'm new to Docker and noticed a warning during installation stating that it will bypass my firewall and expose my device to the internet. Can someone explain what…