Firewall blocks the wifi connection of my Canon MP620? Why?
I've had my Canon PIXMA MP620 set up wirelessly to my MacBook Pro for months now, and just today it turned out that it stopped working. After lengthy search for the cause of the problem, I discovered that my MacBook's internal firewall started blocking the connection to the printer. If I change it to 'allow all incoming connections', it works, but obviously I don't want to keep it that way. The other option is to 'set access for specific services and applications' and add the required utilities to be able to print, but that means that now every time another application needs an access, I have to click on the pop up window to allow it, which is very annoying.
I've tried everything to fix this problem and let firewall to be set to 'allow only essential services' and still let my printer work as before, but nothing works. I updated printer's drivers and software, changed firewall settings a million times, reinstalled the printer again and again. The threads from other forums don't solve anything and it seems that a lot of people don't understand the problem.
Recently, I downloaded the EFI Firmware and SuperDrive updates (which, by the way, don't work correctly). I wonder, if this whole firewall/printer problem has something to do with it. It's just so irritating when everything works very smoothly and suddenly it stops, because of some stupid updates that destroy your settings and preferences.
Help, please. Thank you.
First of all, I don't believe the updates would have been a cause. I have a 10.5.8 setup that is isolated from Software Update, hence the Firmware update hasn't been executed, and it exhibits the same issue.
When you think about it, the operation of the firewall makes sense. It would be difficult for Apple to foresee that a third-party application like the Canon IJ Network Utility (aka BJPrinterApp2) is an essential service. There is certainly no provision for a user to set what they deem to be essential, hence the additional function of selecting specific apps.
For the record, HT1810 states the following;
Allow only essential services:
This is the most conservative mode. Mac OS X will block all connections except a limited list of services essential to the operation of your computer.
The system services that are still allowed to receive incoming connections are:
* configd, which implements DHCP and other network configuration services
* mDNSResponder, which implements Bonjour
* racoon, which implements IPSec
If the MP620 used Bonjour instead of its proprietary protocol, then you may have a solution. Connecting a printer to the USB port of an Airport device still functions with the essential services setting selected.
However, the printer doesn't use Bonjour so IMO I think you have a decision to make. Turn off the firewall or live with accepting the prompts for adding these services to the list.
Like I said, this is just my opinion. Maybe someone else can provide you with a usable solution?
Pahu
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