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Firewall Client Error! Help!

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Firewall Client Error! Help! - 3.Sep.2002 6:09:00 PM   
Elizabeth

 

Posts: 53
Joined: 16.Apr.2001
From: Belo Horizonte, Minas Gerais, Brasil
Status: offline
Hi all,

When I try update the Client Firewall I receive the message:

"Server suddenly disconnected. Possible cause: The client version may not be supported version of client software."

What¦s wrong?

Thanks

Elizabeth
Post #: 1
RE: Firewall Client Error! Help! - 4.Sep.2002 3:09:00 PM   
rmatthewcole

 

Posts: 26
Joined: 12.Mar.2001
From: Auburn, AL USA
Status: offline
This is the exact same error message I was getting last week on my ISA Server. Our server had been running fine for months with no changes and we suddenly started getting this message. Does your web proxy service still work as expected? If so, it sounds like you have the same problem. The only thing I could find to fix it was to uninstall and reinstall ISA. Let me know how you make out..

(in reply to Elizabeth)
Post #: 2
RE: Firewall Client Error! Help! - 4.Sep.2002 3:29:00 PM   
Elizabeth

 

Posts: 53
Joined: 16.Apr.2001
From: Belo Horizonte, Minas Gerais, Brasil
Status: offline
Hi,

This happened because, if you installed SP1, is recommended that reinstall the client. The SP1 updated the client in ISA server but the previous installation in client not.
So, you have to uninstall and install or execute the firewall client setup and select repair.

I hope help you!

Elizabeth

(in reply to Elizabeth)
Post #: 3
RE: Firewall Client Error! Help! - 27.Sep.2002 10:37:00 PM   
jgisler

 

Posts: 56
Joined: 10.Apr.2001
Status: offline
I'm having the same errors. Was running fine for months. I tried the repair thing, no go. Tried removal & re-install of client, still doesn't.

This is all relative to deny rules for me. If I make any deny rules, the firewall client can no longer communicate with the ISA server. As soon as I remove the rule, all is well. This is absolutely unacceptable as a firewall. Strange thing is, my *nix firewalls don't do this. I have done a fresh install of win2k Adv. Server w/SP3 along with ISA w/SP1. Same issue occures. Anyone experience anything similar? [Roll Eyes]

(in reply to Elizabeth)
Post #: 4
RE: Firewall Client Error! Help! - 29.Sep.2002 3:23:00 PM   
lemonwater925

 

Posts: 417
Joined: 22.Mar.2001
From: North of the 49th
Status: offline
Check out this article

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q271471

(in reply to Elizabeth)
Post #: 5
RE: Firewall Client Error! Help! - 30.Sep.2002 8:08:00 PM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
quote:
Originally posted by jgisler:
I'm having the same errors. Was running fine for months. I tried the repair thing, no go. Tried removal & re-install of client, still doesn't.

This is all relative to deny rules for me. If I make any deny rules, the firewall client can no longer communicate with the ISA server. As soon as I remove the rule, all is well. This is absolutely unacceptable as a firewall. Strange thing is, my *nix firewalls don't do this. I have done a fresh install of win2k Adv. Server w/SP3 along with ISA w/SP1. Same issue occures. Anyone experience anything similar? [Roll Eyes]

Hi J,

Sounds like a name resolution issue to me. Make sure the clients can resolve the name of the ISA Server to the internal address of the ISA Server.

HTH,
Tom

(in reply to Elizabeth)
Post #: 6
RE: Firewall Client Error! Help! - 2.Oct.2002 3:00:00 PM   
Elizabeth

 

Posts: 53
Joined: 16.Apr.2001
From: Belo Horizonte, Minas Gerais, Brasil
Status: offline
Hi,

The error persist. Sometimes the FW icon appears whit a red exclamation sometimes not.

The error message: the server is not responding when a client requests an update.

Somebody help me!

Thanks [Mad]

(in reply to Elizabeth)
Post #: 7
RE: Firewall Client Error! Help! - 2.Oct.2002 9:13:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi Elizabeth,

can you tell us more what is between the firewall client and the ISA server (hubs, routers, switches, ...) ? Is some unusual software installed on the pc? ....

HTH,
Stefaan

(in reply to Elizabeth)
Post #: 8
RE: Firewall Client Error! Help! - 3.Oct.2002 5:09:00 PM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hey guys,

I find when name resolution is not working, the firewall client will intermittantly fail.

HTH,
Tom

(in reply to Elizabeth)
Post #: 9
RE: Firewall Client Error! Help! - 7.Oct.2002 8:28:00 PM   
Elizabeth

 

Posts: 53
Joined: 16.Apr.2001
From: Belo Horizonte, Minas Gerais, Brasil
Status: offline
Hi,

So, What I have to do to resolve name resolution to resolve this problem?

I did so many things that I don¦t know more what to do.

Thanks

Elizabeth

(in reply to Elizabeth)
Post #: 10
RE: Firewall Client Error! Help! - 8.Oct.2002 12:35:00 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi Elizabeth,

You need to make sure clients can use DNS and/or WINS to resolve the name of the internal interface of the ISA Server. That means checking up on your WINS/DNS infrastrucutre on the internal network.

HTH,
Tom

(in reply to Elizabeth)
Post #: 11
RE: Firewall Client Error! Help! - 24.Oct.2002 9:49:00 PM   
DAZ

 

Posts: 2
Joined: 24.Oct.2002
Status: offline
You also may want to check the firewall logs for a lot of traffic to UDP port 137. This is a symptom of the OPASERV virus. It eats up all the UDP ports and doesn't allow any traffic through the firewall, although the Web Proxy works just fine. Also, all the firewall clients will show that the ISA Server is inaccessible.

A single machine infected with this virus can take down the firewall in no time.

(in reply to Elizabeth)
Post #: 12
RE: Firewall Client Error! Help! - 24.Oct.2002 9:50:00 PM   
DAZ

 

Posts: 2
Joined: 24.Oct.2002
Status: offline
You also may want to check the firewall logs for a lot of traffic to UDP port 137. This is a symptom of the OPASERV virus. It eats up all the UDP ports and doesn't allow any traffic through the firewall, although the Web Proxy works just fine. Also, all the firewall clients will show that the ISA Server is inaccessible.

A single machine infected with this virus can take down the firewall in no time.

(in reply to Elizabeth)
Post #: 13
RE: Firewall Client Error! Help! - 24.Oct.2002 9:53:00 PM   
Elizabeth

 

Posts: 53
Joined: 16.Apr.2001
From: Belo Horizonte, Minas Gerais, Brasil
Status: offline
What I have to do to block it?

Thanks

Elizabeth

(in reply to Elizabeth)
Post #: 14
RE: Firewall Client Error! Help! - 31.Dec.2003 5:52:00 PM   
jvc

 

Posts: 17
Joined: 27.Jan.2003
From: Wayne, NJ, USA
Status: offline
ok, I got this Firewall Client disconnecting thing cracked.

It was MSBLAST!

We pushed the client to a few people yesterday and one of them had MSBLAST.
The FW logfile was HUGE and listed the msblast.exe executable.

Simply went to that person and cleaned up their laptop.

I would imagine any virus that uses tcp/ip or rpc type hacks would hammer the proxy if firewall client was turned on.

(in reply to Elizabeth)
Post #: 15

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