SBS2008 Slows Internet Access

Hi All

I have a SBS 2008 server which , when connected to the network drops the internet speed from 5Mb to 0.5Mb on all clients.

The server is fully service packed, does not have forefront on it (Has the following):

SBS 2008
ESET for Exchange server
Blackberry Enterprise Server Express
Exclaimer Mail Utilities

I have checked DNS Forwarders and tried several, updated the NIC driver, ran the "Fix my Network" wizard, restarted the server and am now pulling what little of my hair I have left out!

I have monitored network traffic also, and it is not excessive, updates are set to download at 22:00 and there seems to be nothing else for me to look into (Hence the 500 points)

All help gratefully accepted!
eruditAsked:
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Did you run the SBS BPA?

Www.sbsbpa.com

It will pick up on a number of NIC tweaks that should be done.

Philip
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SISAntCommented:
so running speedtests from both the server and the client you get good speed on the server and bad speed on the client?

What networking/switching hardware are you using?
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eruditAuthor Commented:
With the server connected - bad speed on server and clients.

Server disconnected - good speed on clients.

We have tried 2 switches, D-link 16 port gigabit and a Level One (Brand) Gigabit - both the same!

I am just running the SBSBPA again
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
When the server is disconnected the clients should lose the ability to resolve DNS since this is supposed to be done at the server.

Are the clients configured to use DHCP and is DHCP properly configured on SBS?

Please post a sanitized IPConfig /All from the server and one client.

Philip
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Llacy80Commented:
Do you have forwarders set up in DNS? Did you enter the forwarder information when you ran the connect network wizard?
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SISAntCommented:
It sounds like somethings wrong with your setup, the clients shouldn't be able to resolve DNS when theres no server in a domain environment (unless you've set up a secondary DNS somewhere)

MPEC has a point, can we see an IPConfig and also do a ipconfig /release (then a /renew and a /flushdns and a /registerdns) on one of the clients whilst the server is connected to see if that resolves.
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connectexCommented:
Are you trying to connect the SBS server via more then one NIC?
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eruditAuthor Commented:
Hi All

Firstly thanks for all the replies!

There are no DNS forwarders set up, have tried with and without them configured!

The server has a single Gigabit NIC connected to a firewall.

We do have additional, external DNS set up on the DHCP server, however have temporarily removed these! - same low speeds with them set and without!

IPCONFIG from a client is as follows:

IP Add: 192.168.111.33
Subnet: 255.255.255.0
Gateway: 192.168.111.111
DNS: 192.168.111.2

IPCONFIG from the server is as follows:

IP add: 192.168.111.2
Subnet: 255.255.255.0
Gateway: 192.168.111.111
DNS: 192.168.111.2

I have been through the BPA for SBS 2008 and there were a few minor network tweaks that I am just working through and will post an additional comment shortly.
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SISAntCommented:
This is a very strange problem, I posed the question to one of my colleagues with another 10 years experience on top of mine and he just looked positively bemused. I'll continue having a think/brainstorm but I don't have anything else for you to try at the moment.

oh actually, with the server connected can you do a traceroute to a wellknown website like google or something. want to see how fast your internal networking is routing.
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eruditAuthor Commented:
I have done a tracert to google.com and the internet system (up to the Router) is responding at 1ms, however from the router onwards the ping goes up to 2000ms +

SBSBPA : I have been through all the highlighted issues and they have all been resolved.

Still the same issue!

However, during installation of SP3 for Exchange, I noticed the speeds improved. I have done some digging and if I turn off the Exchange Transport service, the speeds go to acceptable levels?
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SISAntCommented:
I'm honestly out of my depth now in regards to ETS, but I have found this.

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_25701528.html

If you're a premium member you'll be able to view it, it as an accepted solution, I can't see it yet as i only signed up yesterday :)
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eruditAuthor Commented:
Fantastic! That did the trick - many thanks for all your help!
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
The solution referred to relates to a third party product, in this case TMG, causing the slow downs.

There is a need here to check the Exchange related utilities that you have installed on SBS to verify which one is causing the problem.

ESET has had issues on SBS. Check their KB.
Blackberry Enterprise Server Express (has their fair share of hiccups).
Exclaimer Mail Utilities (not familiar with this one).

Given that there are _three_ products integrated on SBS that want access to Exchange the problem is likely due to this particular setup.

Philip



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SISAntCommented:
I agree with MPEC on BES... *shudder* I have had nothing but problems with BES, and why people keep wanting to use it I will never know.
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Windows Server 2008

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