We have just installed norton, so have lots of powerful firewalls. However we now cannot use msn messenger, it comes up with this message:
"We could not sign you into MSN Messenger. It appears that you are behind a firewall that might be preventing you from connecting to the NET Messenger service. 0x81000365"
Please Help us!!

I dont know how to use msn through a firewall. I also cannot get through to my inbox.I have norton and i want to know how to use msn

The bad news is the MSN Messenger uses dynamic ports that is you have to make big holes in your firewall (unless you have a UPnP-enabled firewall). For more details go to: http://www.microsoft.com/technet/prodtechnol/winxppro/deploy/natfw.mspx
To conclude, you need to open the following ports:
1. UDP ports between 5004 and 65535 to allow signalling and media streams;
2. TCP ports between 6891 and 6900 to allow file transfer
3. 3389 port for remote assistance
I hope it will help,
Adrian.

This is a know issue that MSN Messanger and the MSN client will be blocked by Norton
Regards, MSN Tier 3 Technician

I'm the same, having trouble with norton and messenger.....I've read all the responses but am still highly confussed as to how to overcome this problem as I don't know my way around computer hard drives that well, therefore all the 'ports' information was nothing but bad jibberish to me. Is there any other way - in english- around this?

here's my problem...I was using MSN Messenger 6.2 all fine and dandy last night (July 10, 2004) today (July 11, 2004) absolutely nothing...and I didn't change any settings, I didn't download any new programs, I didn't delete anything off the HD, I didn't do anything to the computer between the time it was working to when it wasn't.
I'm getting the same error message about this error code 0x81000365 about firewalls and I don't have a firewall.
So if there could be someone out there who could be of assistance it would be greatly appreciated.

i am behind a firewall as i am staying in a hostel. the TCP ports are open but the UDP ports are not. how to open the ports?

Go into ur firewall eg. Norton personal firewall, zone alarm, ETC and give MSN MEssenger FULL access. U have to ADD msn messenger to the Allow list. some firewalls say u have to click on PERMIT ALL or ALLOW ALL. As long as u go into ur firewall and ADD msn messenger to the list u'll be fine.

i have norton, but im not sure how i can add messenger onto it. i don't know what part i need to go into before i can add it, and once im there how to! i just need to know how to get there!