Networking printer problems - i.e. Brother MFC-425CN - seem to be solvable by unchecking [Block fragmented IP datagrams] under [Advanced Attack Detection and Prevention].
Additionally, deleting all entries in the Network Monitor and [defining A New Trusted Network] by using the wizart in [Tasks]
As I’m new to this forum - or any other forum for that matter - I do hope this post is put in the proper way in the right place.
I’d like to share my experience with a problem that finally appeared to be a Comodo-firewall conflict with my Brother MFC-425CN network printer.
The problem that I encountered was known by Brother’s helpdesk, who could not give me any other solution than switch back to the Windows firewall … an advice that appeared to be unacceptable to me. (:AGY)
I recently installed Comodo firewall on 2 PC’s in a small home network, consisting of:
- one Pentium II / Windows 98SE system,
- one Pentium III / Windows XP Pro system,
- one Pentium IV / Windows XP Home Edition PC and
- one Brother MFC-425CN network connected printer.
After installation all seemed to be working fine, until attempting to print a .pdf document.
This printing-attempt resulted in very different types of errors on the PC’s and even a complete system block on the PIV / Win XP Home system.
The Windows taskmanager showed a driver, called BrMfcWnd.exe, mentioned - even up to 25 times - in the “Processes”-window. All of this without any response of the printer, while all other functions of Windows seemed to be blocked.
Only by manually stopping the BrMfcWnd.exe-process, the system became operational again.
Since BrMfcWnd.exe cannot be found on this PC by means of Windows Exporer, I learned from the Brother helpdesk that this program is sent from the printer to the PC in a bi-directional process.
Not being an IT-specialist myself, I tried to find a solution to establish a possibiliy for bi-directional communication within the network.
First I deleted all entries in the Comodo firewall [Network Monitor] and
Secondly I [defined A New Trusted Network] by using the wizart in [Tasks].
(The firewall is in learning mode, so I guessed it will restore any settings that should not have been removed)
By trial-and-error I found out that unchecking [Block fragmented IP datagrams] under [Advanced Attack Detection and Prevention] finally solved the problem.
Also, a considerable increase on inter-network communication speed was achieved.
Is this the proper solution to the problem, or did I also open the firewall for communications with malicious intent?
If this is not the proper solution for this problem, what is?