3.0.17-.22:Lots of Network Connection Problems (MERGED TOPIC)

[Guest]

[DyNaRaX]

thx for the info

I noticed that both links speak about wireless issues after update, on my desktop I had the problem with a wired connection.

[sded]

Haven't seen other reports of that, but many wired connections already use fixed IPs or have already set DHCP profiles from normal usage.  Added it to the list but didn't change title.  Have submitted a bug report to the developers to see if they can get more information on it with their tools.  Try the fixed IP and see if it works for you. 

[sded]

Something else to try.  Rain today, so tried doing a little logging with the neighbors wifi system and the new version, to see what the UDP traffic is.  Still not DHCP, but maybe using something a little different.  Set your NIC back to "get an IP address automatically"  Then try adding the global rule:
Allow and Log/UDP/IN/Your router IP/any/any/any and see if you can get an IP.  Usually should show traffic on port 1900, but there may also be broadcast messages
You may also need to add this to WOS.
Also make sure you do not have a global rule that blocks outbound UDP.
And you may also need to make a rule for svchost.exe
allow/udp/out/any/any/any/any
Trying to see if some of the (hidden) defaults changed for version 3.0.17.
Let us know if that helps. 
Also, please tell us if you imported your settings from 3.0.16 or made new settings for 3.0.17 (or .18 if you went there directly).

[DyNaRaX]

Haven't seen other reports of that, but many wired connections already use fixed IPs or have already set DHCP profiles from normal usage.  Added it to the list but didn't change title.  Have submitted a bug report to the developers to see if they can get more information on it with their tools.  Try the fixed IP and see if it works for you. 

When using fixed IP I was able to connect to the network but didn't get any further then the router, so no internet connection.

[sded]

Are you trying to make 2 connections from the same computer?  What router are you using?

[DyNaRaX]

Are you trying to make 2 connections from the same computer?  What router are you using?

With my fathers laptop I was using a Linksys Wifi router.  I tested the wifi and the cable connection seperatly.  It worked fine for one account but the wifi failed on the other account.

[sded]

OK, as long as the wired connection wasn't up, the wireless should have worked.  Your father isn't using 3rd party firmware on a wrt54g, is he?  Did you check that the router actually had a WAN IP?  What kind of NIC are you using?

To be sure I understand:
You tried a fixed IP on a wireless connection and successfully connected to the router
The router had an internet address
There were no other connections to the internet from that machine
Your computer could not complete the wireless connection to the internet

You can try to open up UDP as suggested above and see if that helps.  I am on Vista, using a wrt54g with tomato, and my connection works fine, but there are similar reports.  I am trying to find out if something changed in the default settings between .16 and .17 that might be causing this problem for some users, but can't replicate the problem myself.
There were no CFP network block messages

[DyNaRaX]

OK, as long as the wired connection wasn't up, the wireless should have worked.  Your father isn't using 3rd party firmware on a wrt54g, is he?  Did you check that the router actually had a WAN IP?  What kind of NIC are you using?

The router has a standard config, no 3rd party stuff.
The laptop is a Acer 4002 with build in Intel wifi adapter (Centrino platform)
The router had a wan connection, my brother was surfing the net on his desktop.  The strange thing is that both nic's (wired and wifi) where working fine on the first account, I logged out and logged in with a second account, under this account the wired worked but the wifi failed.  The computer could see the wifi network but he didn't get an IP.

To be sure I understand:
You tried a fixed IP on a wireless connection and successfully connected to the router

I didn't try the fixed address on the laptop.  I tested a fixed IP on my desktop on Friday where I had the same issues after update, impossible to get an IP from the router.

There were no CFP network block messages

nope

[sded]

Something else to look at.  I used Wireshark to capture all of the packets involved in the successful setup of a wireless internet connection on my computer.  If any of you have the time, download Wireshark (or use it) to compare what is happening on your system.  Note that the first two lines are really the DHCP connection to the router, the rest are involved in setting up the internet link afterward.  Still looking for something not happening in these failed connections. 

[GT086]

Okay, I recently installed Comodo and have noticed two issues that I believe are being caused by it.

The first is that every so often, I will lose my connection with my wireless network. I can quickly get connected again by repairing the connection, however, when doing so, it brings me to the second issue, it's unable to clear the DNS cache.

I've seen several other people with the wireless network issue and one of the posts suggested I setup a static IP address. I did that and it had absolutely no affect on the situation. The connection will still drop. It's a rather annoying problem that hopefully somebody can help me out with.

As for the DNS cache issue, I searched and saw several solutions that seemed extremely easy to do. However when I tried to go about that, I noticed that they were obviously written for a previous version of Comodo, as I have none of the tabs or options they want you to modify. Again, hopefully somebody can help me out with some updated solutions on this problem as well.

[plexos]

Comodo firewall blocked my wireless internet connection and didn't give any clues even though alerts were always popping up for other stuff. Extremely annonying - I had to figure it out myself that the firewall was the problem and shut it down after which the wireless connected OK. I couldn't fix Comodo to allow the connection so I took the guaranteed route which is:-

UNINSTALL COMODO AND INSTALL SUNBELT KERIO FIREWALL.

After that all OK.

[panic]

I logged out and logged in with a second account, under this account the wired worked but the wifi failed.  The computer could see the wifi network but he didn't get an IP.

Have you tried manually releasing the DHCP lease and manually renewing it, under this second account?

I didn't try the fixed address on the laptop.  I tested a fixed IP on my desktop on Friday where I had the same issues after update, impossible to get an IP from the router.

Enable logging on all rules, clear the logs, reboot and try reconnecting. After a success or a fail, disable logging on all rules (except those you want to log) and have a look through the logs. This method should trap any blocking that CFP is doing.

Ewen :-)

My personal opinion, although DHCP is horribly convenient, security is about control, and static IPs allow YOU to control the addressing range, not the router.

If your wifi NICs support alternative configs, disable DHCP on the home router, set your home LAN up to use static IPs in an uncommon range (172.16.123.X), set the primary IP address range on the wifi card to use the uncommon address range and set the alternative address to use DHCP (for when you're away from home.

Just a thought. 

[GT086]

Nothing?

[Matty_R]

I take it your using a wireless router GT086,do you have entries for it in Global Rules at the top by using the "Stealth Ports Wizard"
My router and computer "talk" to each other once every hour and a half,are you getting anything in the Firewall logs relating to ports source port 68/destination 67.

Matty

[sded]

One suggestion to see what is happening-download a copy of wireshark and take a look at the traffic around connection drop.  Maybe losing your DHCP lease if it happens every 30 minutes or so.  What kind of router are you using?  What is your OS?  What is your CFP3 version?

[Tags:]