In a tightly closed down environment, I have a linux machine acting as router with a fireHOL firewall (iptables), limitting not only inbound traffic, but also outbound traffic.
Office 2019 applications running on windows 10, suffer from frequent hangs and freezing. We do not think this is related to bad installations (everything was tried already), but rather the firewall blocking lots of connections to the outside world.
FireHOL is far from convenient when it comes to logging. We see a lot of blocks, but cannot really point the finger back to the office products or microsoft.
We would like to understand what needs to be whitelisted for Office 2019 products (Word, Outlook, Excel) to work without frequent freezing.
FireHOL does not do FQDN whitelisting directly, but needs a list of IP adresses to whitelist. Unfortunately, the iblocklist_org_microsoft (see http://iplists.firehol.org/?ipset=iblocklist_org_microsoft ) is way outdated (updated last 2017).
Question: What needs to be open from inside to outside for Office 2019 products working flawlessly?
Also, any hints on better troubleshooting would be appreciated.
Thanks for any pointer.
Dan