invalid server response

Could you expand a bit on what you are using to download the file, and from where you are downloading the ISO?
Are you coming from a residential address or a corporate network that might be blocking some file types?
 
Ah Ic, I thought you were having trouble downloading the proxmox ISO.
Usually that error message is a bit longer and contains a reason why it is deeming the response as invalid. Could you please post the full error message?
Can you ping anything outside your local network from your proxmox server? You could test this by running the command ping -c 4 kernel.org in your node's shell.
 
Ah Ic, I thought you were having trouble downloading the proxmox ISO.
Usually that error message is a bit longer and contains a reason why it is deeming the response as invalid. Could you please post the full error message?
Can you ping anything outside your local network from your proxmox server? You could test this by running the command ping -c 4 kernel.org in your node's shell.
ping: kernel.org: Temporary failure in name resolution
 
Alright, your server's networking setup seems to be botched, can you ping other servers by IP? For example 1.1.1.1?
If yes, you might just need to set your DNS server at your nodes settings under System > DNS.
If not, please double-check your /etc/network/interfaces and upload it here if you have troubles configuring it correctly.
 
Alright, your server's networking setup seems to be botched, can you ping other servers by IP? For example 1.1.1.1?
If yes, you might just need to set your DNS server at your nodes settings under System > DNS.
If not, please double-check your /etc/network/interfaces and upload it here if you have troubles configuring it correctly.
I cant reach to 1.1.1.1
/etc/network/interfaces:
auto lo
iface lo inet loopback

iface enp3s0 inet manual

auto vmbr0
iface vmbr0 inet static
address 192.168.1.2/24
gateway 192.168.1.2
bridge-ports enp3s0
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094

iface wlp4s0 inet manual
 
You probably made a mistake when setting the gateway, it is currently pointing at 192.168.1.2 which is your proxmox instance itself. From the network scheme, I would guess that your router has the classic 192.168.1.1 IP. You can change the gateway in the UI by selecting your node and go to System > Network > vmbr0 > Edit.
 

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