The commit on which I compiled is:

de795b1a6

 

I enabled verbose mode as advised:

 

And got these messages in the log with fetchurl trying to access the depot:

Using UDP link CLN src 10.0.1.2:32768

New ARP entry 10.0.1.2

Answer ARP request for router IP

[uplink] Unroutable packet

 

I'm testing on a simple network:

Computer -> ADSL router -> Internet

 

At first I tried this configuration, which worked:

<domain name="uplink" interface="192.168.1.188/24" gateway="192.168.1.1">

<domain name="default" ...

  <dhcp-server ...

In this section I replaced dns_server_from="uplink" with dns_server="8.8.8.8"

 

Then I tried removing previously mentioned interface and gateway settings, finally leaving just the dns_server setting intact. This was enough to solve the problem:

ram fs -> use

ram fs -> inspect

Switched to Inspect tab

cd config

cp managed/nic_router .

vim nic_router

:%s/dns_server_from="uplink"/dns_server="8.8.8.8"

:w

 

The culprit is Cloudflare's 1.1.1.1 DNS server I used as the default DNS on my ADSL router, but not the alternate 1.0.0.1 or Google's 8.8.8.8. I wonder why it seems incompatible.

 

I also tested this with Virtualbox on Ubuntu using bridged networking and Sculpt OS 20.02 again, and this time it worked.

Alternative solution: changing the ADSL router's default DNS in the router's configuration interface.

 

On a side note, the OS image based on commit de795b1a6 has some issues with the GUI (missing GUI (focus) and GUI server nodes when I want to attach themed wm), but, since network works normally now, I can use Sculpt OS 20.02. There, trying to use ram fs for Virtualbox NOVA and Firefox @ Tiny Core hangs most of the GUI during fetching (out of space?), so I'll have to experiment with a hard drive install.

 

Thank you for your help,

Dima