Problem to access mailbox from one sub-network since 1 day

Kishkool
Kishkool used Ask the Experts™
on
Hi,

I've got an annoying problem since yesterday.

I've got one network in 192.168.0.X and another in 192.168.42.0.
My exchange serveur (2003) is on 192.168.0.X network.

all is ok for the first subnetwork but for 42.X since yesterday impossible to use outlook.

I can access web access from http://192.168.0.9/exchange without problem...
But when i start outlook, normally it should ask for a password, now it do not.

If i try to create a new profile, when i put ip server adress and the name to search it says that it can't connect to exchange...(but i can ping and use OWA)

Thank you for your help
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NenadicCTO

Commented:
What do you have between those subnets? Any form of firewall?

Author

Commented:
I've got a juniper firewall and a D-link switch.

Author

Commented:
But i've made no change on them, it's not the first time this problem come. Last time, It has come to work again with no change.

But this time it seems not to want to return...
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NenadicCTO

Commented:
On the client computer, modify the c:\windows\system32\drivers\etc\HOSTS file by adding the following to the end:
192.168.0.9    <NAME OF EXCHANGE SERVER>.<AD-Domain>

For example:
192.168.0.9    exchsrv01.mycompany.local

You can use Notepad to open the HOSTS file.
NenadicCTO

Commented:
Sorry, then try to complete profile setup using the Exchange server name.

Author

Commented:
Thanks for your help but i've already tried this.

When i put netstat i've got
exchangeserver.domain.local:epmap SYN_SENT


If i launch OWA i've got
exchangeserver.domain.local:https ETABLISHED

(so it's work)

I'm lost...
CTO
Commented:
It has to be down to the firewall then. Are you able to post firewall rules here?
We're looking for RPC ports specifically. If you have a firewall between Outlook and Exchange, RPC ports have to be configured statically.

Author

Commented:
set address "Bureautique" "proliant" 192.168.0.9 255.255.255.255
set address "technique" "technique-lan" 192.168.42.0 255.255.255.0

Ok so here my exchange serveur is add in group Bureautique.
Network who got problem is group technique (i'm 42.240)


set policy id 4 from "technique" to "Bureautique"  "Any" "Any" "ANY" permit
set policy id 4
exit

So all port is allowed to talk with Bureautique group, including my exchange

Any way, it was working last week and no change were done on firewall so...i don't understand.
I just can't communicate with "outlook autorisation service".. :(
NenadicCTO

Commented:
You need to be able to communicate with DC as well. Where is the DC?

Author

Commented:
DC is domain controller?

I have no active directory set for the moment.
I've got no domain when we log to computer, exchange server is a windows serveur.
I use it only for create mail user and some IIS service.
NenadicCTO

Commented:
Exchange cannot install without an Active Directory domain. So, you either have a Domain Controller or you had one. If you had one and now you don't - that's the problem.

Author

Commented:
Exchange still work (OWA, for other subnetwork).

Excuse me if i'm not clear, we 've got a subdomain : mycompany.local
It's all i can say. if i ping exchange.capitalvision.local it works...
NenadicCTO

Commented:
OK. So where is the DC for mycompany.local?
For testing purposes, are you able to open up all ports on the firewall between these two subnets - to remove firewall out of the equation?

Author

Commented:
Ok i've git all port open beetween subnet. Not working.

I just arrive i'm not sûre. I think this is exchange serveur but there is also a samba serveur. 192.168.0.10.

But all is accessible. It's amazing. And 2 days ago all was working great..
NenadicCTO

Commented:
Nothing in event logs in Exchange? System, Application, Security?

Author

Commented:
I'll look on it tomorrow and keep you inform.
Thks

Author

Commented:
Ok so my DC is my exchange server.

Where can i see event logs? I've got only tracking log.
Any way i've look everywhere and i've got not alert who explain my problem.

Author

Commented:
Ok...i've put company.local in server name then "find a name"
It asks me for the password (allelujah) but it doesn't want my password.

I've close and restart, and now i've got again can't connect to exchange server..

Author

Commented:
Ah !
Interesting thing.


I'ev got a DNS interne serveur : 192.168.21.1.

On subnet 192.168.0.X if i do

nslookup exchange

I got

Serveur :  srvdns.company.local
Address:  192.168.21.1

Nom : exchange.capitalvision.local
ip : 192.168.0.9

But on my 42.0 network i've got :


Serveur :  srvdns.company.local
Address:  192.168.21.1

srvdns.company.local can't find exchange : non existent domain...

Author

Commented:
Ok, the problem is resolved. It came from the firewall, even if everything was open there had also NAT rules that disrupted the port 135 (RCP exchange). Thank you for your help.

Author

Commented:
Thank you

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