Connectivity to Proxmox PVE GUI and SSH are extremely slow

J

jadenswang

New Member
Oct 15, 2023
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I have been banging my head against the wall for a while now and really cannot figure this out.

As an example: my Proxmox server is configured at 192.168.1.10 and connecting to it should be as easy as ssh root@192.168.1.10 or navigating to https://192.168.1.10:8006 while on the same local network. However, suddenly, a few days ago, connecting to this has become slow to the point I cannot access my PVE "remotely". I'm on the same network and cannot connect. Once in a blue moon I'm able to ssh or connect to the web gui but both quickly freeze and drop the connection.

However, my VMs are still fully accessible and are lightning quick.

I am at a loss and am about to reinstall Proxmox. Any support would be greatly appreciated.

Proxmox V 7.3
 
Last edited:
jadenswang said:
Proxmox V 7.3
Click to expand...
So you never did an upgrade to fix bugs...no idea if this would help but usually the first step would be to upgrade to the most recent version if something isn't working as expected. We are on PVE 8.0 while 7.4 is still supported until mid 2024.

Did you try to ping the PVE host? Any lost packets or high delay?
 
Pinging said host 192.168.1.10 is extremely quick, sub 3ms no packet loss. I will perform an update asap and let you know if any issues arise.
 
Did you ever diagnose this problem? I'm experiencing the exact same symptoms. Running PVE 8.3, recently upgraded from PVE 6.4. I have just downgraded from the 6.11 to the 6.8 kernel to see if it makes any difference.
My network config is 4 NICs: 2 and 2 in LACP bonds; those two active-backup bonded together, and the bridge on top of that. This was running fine for the best part of a decade, and is still running fine on another node still on PVE 6.4
Like @jadenswang, all the VMs and containers have lighting fast network access, but ssh and webgui access to PVE is basically unusable.
 
This issue is often related to MTU mismatches, NIC bonding instability, or firewall rules blocking GUI/SSH traffic. Try the following:

1️ Check MTU Settings on All Interfaces:

bash
Code: 
ip  link show
Ensure all interfaces (including bonds and bridges) have the same MTU (e.g., 1500 or 9000 for jumbo frames).

2️ Check for High CPU Usage on Proxmox Host:

bash
Code: 
htop
If kworker or irqbalance is using high CPU, it might indicate a network driver issue.

3️ Disable Firewall Temporarily (for Testing):

bash
Code: 
pve-firewall stop
If SSH/Web GUI works fine after this, adjust firewall rules.

4️ Try Restarting the Network Stack:

bash
Code: 
systemctl restart networking
 
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