Firewall blocks Internet Connection [at] School [RESOLVED]

Comodo Internet Security - CIS Firewall Help - CIS
#1

Hi,
first, i am german, so please excuse my poor explainment. Ask me if you need more details.
I am using Comodo quite a long time at home now. Great Suite!
This month i started to study, and at school we can use WLAN to connect to the Internet.
But i have Problems with connecting. well not connecting exactly, but with the internet (browsing). Pages load (<2 min) then comes an error (Connection to server resettet).

I am using Win7 now (but it didnot work with XP as well). At Home WLAN workes perfectly.
To connect to the WLAN (WPA2) you need typ your personal account+pw. Windows tells me, i am connected.

I also asked the people at the IT Service Center at School. they are in charge of all computer at the campus.
They told me i am connected to the server just as everyone else. I could also “ping” their servers.
I am not sure, but i think i could get 1 email with thunderbird.

They published a how to connect to the WLAN at their page. It is german but maybe the pictures help you. http://www.fh-sw.de/sw/rz/sammlung/dokumente/wlan_zugang_install.pdf For translations, just ask me.

Uninstalling instantly solve the problem. Internet works. Even the Internet Page you get by uninstalling comodo loads.

What do i have to do, to get internet access?
As you might think, I am not at school right now, so i cant test anything.
thx for your help, i would like to keep using comodo.

#2

Hi KUGA and welcome to the forums.

You could try to disable Blocking Fragmented packets.
Firewall > Advanced > Attack Detection Settings > Miscellaneous > Block Fragmented IP datagrams.

If that doesnt work can you pls do this.

Could you post a screen shot of when you connect to the network.

Did you by any chance stealth ports with CIS, or does this happen with defualt setting?

Thx.

#3

as i said i cant test till monday. what should the screenshot show? the comodo window of “new network found”?

did you mean change? i dont understand this sentence. And yes it happens with default settings, fresh installed windows with fresh installed comodo Suite

#4

Yes i meant change… i hate that spelling mistake.
I needed to be a bit more specific… sorry my mistake.

Take a Screenshot of Firewall >View Firewall Events, when you connect to the network, so we can tell what is being blocked.

#5

comodo seems to change something in my (windows) network stettings. Because disabled CIS and even closed doesnt help. only uninstalling

#6

Sounds like a possible DNS issue to me. Did you opt to use Comodo’s secure DNS on install? It’s the only thing that I can think of, at the moment, where CIS changes the Network Settings (ie. the DNS servers) of the host system.

#7

I first thought it could be MTU size but if it only works with CIS uninstalled I’m going for issue’s with the PEAP/MSCHAP this could be a bug. According to the documentation he should have set the IP settings both to Automatic (IP+DNS)… it is a good thing to check though.

I read the document and they are using PEAP(802.1x)/MSCHAP are you aware of working setup’s like this Kail ?

#8

The DNS guess was mainly based on KUGA’s description of the problem.

Not really… sorry. But, wouldn’t an issue with authentication cause an out-right permanent failure rather than what has been described?

#9

Could well be, i think we need a bit more feedback from the user…

#10

I tried both, Comodo DNS and default. Does not work.
Well, i will print this posts here and try Omletguy´s suggestions tomorrow

#11

Worked! Thx

#12

Your welcome. :slight_smile: