Question

OWA Certificate through ISA 2004

Asked by: CaptainGiblets

I have installed an Enterprise CA on one of our servers. I went through the process of creating a certificate through the CA and enabled certificates on the default website on the mail server.

If i connect internally to http://mailserver/exchange then i can connect fine

however if i connect remotely using http://mail.domain.com/exchange i get a page that says

The page must be viewed over a secure channel - http error 403.4
This makes me believe there is a problem with the ISA set up port 443 is forwared to port 443 of the isa server on our router exactly the same as port 80 to port 80 so there should be no issue there.

ive attatched several screenshots of the ISA set up - The isa server can also browse to the https webmail server internally fine. however i get a certificate error that says.
"Mismatched Address - The security certificate presented by this website was issued for a different websites address."
However i think this is just because i set the certificate up under the name of the external DNS address instead of the internal.

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Asked On
2009-10-26 at 03:44:45ID24843029
Tags

ISA 2004

,

Certificate

,

ca

,

ISA

,

OWA

,

Exchange 2003

Topics

MS Forefront-ISA

,

Exchange Email Server

Participating Experts
1
Points
500
Comments
20

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Answers

 

by: keith_alabasterPosted on 2009-10-26 at 03:57:19ID: 25661021

Have you exported the new cert from the exchange server - including the private key and then imported it to ISA into the computer account - personal store?

 

by: CaptainGibletsPosted on 2009-10-26 at 04:08:00ID: 25661075

yes i went to the iis console on exchange into directory security. Clicked on Server Certificate and exported it as a pfx file then imported it into personal store on the ISA server.

its the 2nd certificate down on the screenshot i attatched.

 

by: keith_alabasterPosted on 2009-10-26 at 04:15:48ID: 25661114

Hmm - generally for this i would be redirecting all traffic onto port 443 - why are you using port 80? That would generally be covered by a separate publishing rule even if it was to the same server.

 

by: CaptainGibletsPosted on 2009-10-26 at 04:20:19ID: 25661133

i will be removing port 80 once i get the external ssl access working. Its just so people can still access the webmail without a certificate until then.

 

by: keith_alabasterPosted on 2009-10-26 at 04:37:47ID: 25661207

Implement it as two publishing rules even whilst you are just testing/proving the scenario - one for port 80 and the other for 443 with the certificate - then lets see what we are left with

 

by: CaptainGibletsPosted on 2009-10-26 at 05:10:38ID: 25661407

i have created the 2 different rules

now when i browse to http its working ok

if i browse to https i get an error message that says

"Do you want to view only the webpage content that was delivered securely?"

if i click no it works fine

if i click yes it says "navigation to the webpage was canceled" on the left and right frame

 

by: CaptainGibletsPosted on 2009-10-26 at 05:13:22ID: 25661426

also if i force ssl connections in exchange i get the same error i 1st posted about.

 

by: keith_alabasterPosted on 2009-10-26 at 06:30:16ID: 25662009

The publishing rule for https is not correct. This is normally due to a DNS error where the name resolution screws up from the ISA to the published server.

I assume you have the basics correct?
http://www.kalabaster.com/dasblog/2009/09/06/ISAServerAndFTMGBasicNetworkAndDNSSettingsOnceAndForAll.aspx

 

by: CaptainGibletsPosted on 2009-10-26 at 06:39:18ID: 25662099

yes, i remember you posted that link on another thread of mine about my sharepoint server in a DMZ, so everything is set up like that.

both ISA servers query our internal servers for DNS and only have 1 external gateway.

why would it work for HTTP and not for HTTPS if they are identical apart from the SSL section?

 

by: CaptainGibletsPosted on 2009-10-26 at 07:40:57ID: 25662675

also im not sure if this will cause an issue but

my certificate i created is for mail.mydomain.com (external dns name)
the internal server is called mail.mydomain.local

 

by: keith_alabasterPosted on 2009-10-26 at 07:43:04ID: 25662696

No - that won't cause an issue because ISA will be responding to the external name - not the internal name. The failure - if any - will be on the bridge from ISA to the OWA server.

 

by: CaptainGibletsPosted on 2009-10-26 at 07:46:08ID: 25662731

i read a guide on the internet that said i would have to put the mail.mydomain.com into the hosts file with the internal IP address of my exhange server, i have tried this with no luck though.

Does the mail.mydomain.com or .local need an entry in my internal DNS at all? even though isa is set up to forward requests to server.mydomain.local

 

by: keith_alabasterPosted on 2009-10-26 at 10:16:57ID: 25664489

ISA needs to be able to resolve the name of the internal host that matches the name on the cert. If the certificate is for mail.external.com then ISA needs to be able to look that name up - internally or through the local hosts file and be given the internal IP address.

 

by: CaptainGibletsPosted on 2009-10-26 at 10:18:46ID: 25664509

as always i have missed out something. on ISA i still had it forwarding the requests to port 80 instead of port 443

I managed to find out that the name of the certificate was incorrect and exchange was refusing it.

so i created a new certificate with the same internal name as the exchange server.

however now when i open owa from external  get a certificate error saying "the security certificate presented by this website was issued for a different websites address" is there any way i can get rid of this message?

 

by: keith_alabasterPosted on 2009-10-26 at 10:19:59ID: 25664519

As per my previous comment

 

by: CaptainGibletsPosted on 2009-10-26 at 10:21:00ID: 25664524

will try tomorrow as im leaving the office now. I posted my last comment before reading yours. will let you know outcome tomorrow. cheers for your help.

 

by: CaptainGibletsPosted on 2009-10-27 at 02:49:57ID: 25670541

Ok i have tried creating a certificate here is what ive done

my external address is mail.mydomain.com/exchange
my internal address is servername.mydomain.local/exchange

i have a certficate that has servername.mydomain.local and this now works fine on SSL
if i change the certificate to mail.mydomain.com and go in to the host file on the isa server and create an entry that looks like this         "exchangeipaddress (tab) mail.mydomain.com"
however i cannot get on to webmail and i get an error 500 about the certificate being incorrect.

am i doing something wrong?

 

by: keith_alabasterPosted on 2009-10-27 at 14:31:48ID: 25677797

 

by: keith_alabasterPosted on 2009-11-04 at 03:14:00ID: 25738141

Thanks :)

 

by: CaptainGibletsPosted on 2009-11-04 at 03:17:31ID: 25738161

No problem thanks for the help. Took me a while to close the question as i had other stuff to do before i could change the certificates again.

20120131-EE-VQP-002

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