> 28/Oct/2019 13:14:16 [housekeeping.lua:24] [lists_utils.lua:475] WARNING: 
> Could not find '/var/lib/ntopng/category_lists/Emerging Threats.txt'...
> 28/Oct/2019 13:14:16 [housekeeping.lua:24] [lists_utils.lua:475] WARNING: 
> Could not find '/var/lib/ntopng/category_lists/Cisco Talos 
> Intelligence.txt'...

I have read the following thread : https://github.com/ntop/ntopng/issues/2456

And tried to remove the files as suggested : 
        • systemctl stop ntopng
        • rm -rf /var/lib/ntopng/category_lists
        • systemctl start ntopng


But this didn't solve my issue. 

Do I need to open a port or grant access to the outside on some specific ports 
? 
We have serious FW prohibiting random outgoing queries… and maybe this is 
causing trouble. 

We are running on the latest release on Ubuntu 18 (Enterprise licence). 

> 28/Oct/2019 13:14:15 [Ntop.cpp:386] Built on Ubuntu 18.04.3 LTS
> 28/Oct/2019 13:14:15 [Ntop.cpp:376] Welcome to ntopng x86_64 v.3.9.191028 - 
> (C) 1998-19 ntop.org
> 28/Oct/2019 13:14:15 [main.cpp:398] Scripts/HTML pages directory: 
> /usr/share/ntopng
> 28/Oct/2019 13:14:15 [main.cpp:396] Working directory: /var/lib/ntopng
> 28/Oct/2019 13:14:15 [HTTPserver.cpp:1325] HTTPS server listening on 443


thanks for your support
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