Hello, I have Proxmo 5.2-1 installed with two nodes working perfectly, and since yesterday one node has problems, and cannot access the VMs, how to

Are you really using Proxmox 5.2.1? That's quite an old version and EOL for years.
Yes, I know, but since it works well for me with those servers I have left it like this until now, that node does not allow me to access it through the web, but through the console it does.
 
Do you have backups of the vms outside of your cluster?
Then it's propably better to reinstall everything with the newest version of proxmox before restoring the backups (this can be tested in a vm before!).
In any case (even when you mange to fix the current failure in your environment) you should update to a newer version since you won't get security upgrades for 5.2.1.
Here is a link to a recent disccusion how to approach such an update
https://forum.proxmox.com/threads/very-out-of-date-cluster.156606/post-715805
 
Do you have backups of the vms outside of your cluster?
Then it's propably better to reinstall everything with the newest version of proxmox before restoring the backups (this can be tested in a vm before!).
In any case (even when you mange to fix the current failure in your environment) you should update to a newer version since you won't get security upgrades for 5.2.1.
Here is a link to a recent disccusion how to approach such an update
https://forum.proxmox.com/threads/very-out-of-date-cluster.156606/post-715805
I do have a save of those VMs but they are old, that's why I wanted to see how I could get it up to save the VMs and install a higher version
 
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I do have a save of those VMs but they are old, that's why I wanted to see how I could get it up to save the VMs and install a higher version
If you still can use your other node I would try to setup a new vm with the newest proxmox ve version and try to restore you backups (you don't need to run them to test that restore works).
 

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