Troubleshooting
Articles in Troubleshooting.
Blog posts
How to Find and Read Proxmox VE Logs: A Beginner's Guide to the Task Log, System Log, and journalctl
When a backup fails or a VM won't boot, the fix starts with finding the right log. This guide walks through Proxmox VE's Task History, System Log tab, and journalctl so you stop guessing and start diagnosing.
How to Fix "Login Failed. Please Try Again" in Proxmox VE (Realms Explained)
Typed the right password but Proxmox VE still says login failed? It's almost always the Realm dropdown, not your password. Here's what realms are and how to fix it.
How to Fix Time Zone and NTP Sync Problems in Proxmox VE (Chrony, timedatectl, and Clock Drift)
Proxmox VE relies on an accurate clock for cluster quorum, TLS certificates, and backup schedules. Here's how to check your sync status, set the right time zone, and fix chrony NTP problems step by step.
How to Fix "Communication Failure (0)" in Proxmox VE (When the Web Interface Won't Load)
Proxmox VE's web interface throwing "Communication failure (0)" usually comes down to one of four things: a full disk, a crashed pveproxy, an expired certificate, or a blocked port. Here's how to find out which, fast.
How to Fix Network Problems in Proxmox VE (VM Has No Internet Access)
Your VM boots fine but can't reach the network. Here's the actual diagnostic order — bridge, guest IP, firewall, VLAN — that finds the real cause in Proxmox VE instead of guessing and reinstalling.
Common Mistakes New Proxmox VE Users Make (And How to Avoid Them)
From deleting local-lvm by accident to locking yourself out with the firewall, these are the beginner mistakes that trip up almost every new Proxmox VE admin — and how to avoid or fix each one.
How to Fix High RAM Usage in Proxmox VE (And What's Actually Normal)
free -h showing 90% used and panicking? Learn why ZFS ARC and KSM make Proxmox VE memory usage look scary, how to tell real pressure from normal caching, and what to actually fix.
How to Fix High CPU Usage on a Proxmox VE Host
Proxmox CPU graph pinned high? Learn how to tell host load from guest load, spot iowait masquerading as CPU usage, trace a busy KVM process back to its VM, and fix the real cause.
How to Fix "VM Won't Start" Errors in Proxmox VE (Common Causes and Fixes)
Your Proxmox VM won't boot and the task log is full of jargon? Here's how to actually read that error, find out what's really wrong, and get the VM running again.
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