New to the forum and hope to get some help & suggestions.
I do IT support for a hospitality company in Namibia (Africa) and took over an IPFire server that’s used as firewall and default gateway. The server was set up by a 3rd party that has since gone out of business. I am not an expert on IPFire or Linux but learned my way around it to be mostly OK in the 4 years I have been here.
We do not have a very complicated setup - 2 MS servers, 20-odd workstations, and some NAS units. As mentioned the IPFire box serves as firewall and all the aforementioned devices use it as a gateway to the internet. We have fibre internet with the fibre modem connected to Red interface and LAN on Green.
I updated from Core-Update-Level 152 or 153 to 155 on Tuesday and it seems since then I am unable to access certain websites and -services. So far the ones in question are MS updates for the 2 MS Server 2012 R2 servers, ESET Endpoint Antivirus 7.x updates and connecting to LiveGrid, a sync service for hospitality establishments and our government’s online tax portal. The vast majority of sites & services work just fine, but the ones above are quite dead I did not get any reports from our ISP that they are experiencing issues, I phoned them anyway and they assured me there are no problems on their side. Also, one is able the access eg. the tax portal when connected a cell phone hotsopt instead of the office LAN or Wi-Fi.
I looked at the firewall logs on the IPFire web interface but I do not have enough know-how to see if anything is the matter, nothing jumps out at me. Our firewall rules are very simple:
Allow TCP 3389, TCP 5111 and UPD 5112 for RDP from any source to our two servers
Deny TCP SSH and 444 from any source to any destination
That is my problem in a nutshell. I hope it’s something simple in the Core 155 update that can be remedied. Hope I included enough info - please say if anything else is needed. Thanks in advance for any help & suggestions!