Tag Archives: exchange 2010

Outlook Web Access fails with “440 Login Timeout”

This posting is ~2 years years old. You should keep this in mind. IT is a short living business. This information might be outdated.

Today I faced an interesting problem. A customer told me that their Exchange 2010, which is currently part of a Exchange cross-forest migration project, has an issue with Outlook Web Access and the Exchange Control Panel. Both web sites fail with a white screen and a single message:

440 Login Timeout

I checked some basics, like certificate, configuration of the virtual directories and I found nothing suspicious. Most hints on the internet pointed towards problems with the IUSR_servername user, which is not used with IIS 7 and later. But authentication configuration and filesystem permissions were okay. Also the IIS end event logs were pretty unhelpful.

More interesting was the change date of the web.config! This file is part of the OWA web app and it’s typically stored under C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa.

Long story short: I found this entry in the file and removed it.

<add name=”kerbauth” />

Looks like someone wanted to setup Kerberos auth for OWA, or did not reverse a change.

Citrix NetScaler and Exchange: Case-sensitivity of internal and external URLs

This posting is ~6 years years old. You should keep this in mind. IT is a short living business. This information might be outdated.

Exchange has known the concept of internal and external URLs for the different services (Outlook Web Access, OAB, EWS, ActiveSync etc) since Exchange 2007. And it’s still confusing people. The internal URL is the URL, that is used to access the desired service from the intranet. The external URL represents the URL that is used to access the service from the internet. Best practice is to use the same URL (the external) for both, use a certificate from a public CA, and use split DNS to access the external domain from the inside of your network.

People tend to imply, that URLs are not case-sensitive. This seems to be true in most cases. The World Wide Web Consortium (W3C) states:

URLs in general are case-sensitive (with the exception of machine names). There may be URLs, or parts of URLs, where case doesn’t matter, but identifying these may not be easy. Users should always consider that URLs are case-sensitive.
Source W3C

Citrix NetScaler and URLs

Citrix NetScaler handles URLs as case-sensitive.

A frequently used concept to load balance Microsoft Exchange with a NetScaler is Content Switching. Policies are used to identify traffic, and actions are used to take action on the traffic that matches the policies. The NetScaler uses the advanced policy engine to create expressions for the Content Switching Policies. When creating a Content Switching policy by creating an expression that uses the CONTAINS operator, you might notice that the results are case-sensitive.

This can be a problem in case of Microsoft Exchange, because /Autodiscover/Autodiscover.xml and /autodiscover/autodiscover.xml, or /ews/exchange.asmx and /EWS/Exchange.asmx are handled different.

Solution

To make sure that different cases are handled, you should add SET_TEXT_MODE(IGNORECASE) to you policy expression. Citrix describes this in CTX115528.

I’ve changed my NetScaler setup script for Exchange to handle this behavior.

Data Protector: Exchange 2010 database recovery from copy session fails

This posting is ~9 years years old. You should keep this in mind. IT is a short living business. This information might be outdated.

The recovery of an Exchange mailbox using a recovery database is usually no big deal. Simply restore the database, create a recovery database and recover the mailbox or items from the mailbox. Sometimes you have the luck that the customer has licensed the Data Protector Exchange 2010 Granular Recovery for Exchange (GRE). This was unfortunately not true in my case. Okay, so let’s do it the old way. The needed tape was available in the library and luckily it was a full backup. So I quickly added a disk to the VM and started the recovery of the database to a temporary location. At this point, the disaster took its course…

Constraints

This isn’t a general problem of Data Protector, it’s a bug. The following constraints met in my case:

Recovery source is a copy session (e.g. post-backup object copy to tape)
Data Protector 7.03
Microsoft Exchange 2010 SP2
Recovery to temporary location

This is the output of “omnidb -session 2014/08/01-6 -detail” for the wanted session. As you can see, this is a copy of session 2014/08/01-3, which was without protection and therefore was removed by Data Protector.

Object name : exchangeserver.domain.tld:/30ae2b6b-df08-4ed1-a030-a7
0dbae354a6/DB2
Object type : E2010
Object status : Completed
Started : Freitag, 1. August 2014, 15:49:39
Finished : Samstag, 2. August 2014, 03:31:22
Object size : 0 KB
Backup type : Full
Protection : Protected for 50 weeks
Catalog retention : Same as data protection.
Version type : Normal
Access : Public
Number of warnings : 0
Number of errors : 0
Device name : HP:Ultrium 4-SCSI_1
Backup ID : 2014/08/01-3
Copy ID : 81705 (Orig)
Encrypted : No
DiskAgent ID : 1406901317

When trying to recover the DB to a temporary location, I ran into this error:

[Normal] From: RSM@backupserver.domain.tld "" Time: 21.08.2014 09:26:21
Restore session 2014/08/21-47 started.

[Normal] From: OB2BAR_E2010_BAR@exchangeserver.domain.tld "MS Exchange 2010 Server" Time: 21.08.2014 09:26:21
Analyzing MS Exchange Server 2010 environment.

[Normal] From: OB2BAR_E2010_BAR@exchangeserver.domain.tld "MS Exchange 2010 Server" Time: 21.08.2014 09:26:30
Restoring database DB2 :
Restore mode : Restore files to a temporary location
Session ID : 2014/08/01-3
Restore only this backup : TRUE
Target client/s : exchangeserver.domain.tld
Restore location : R:\RDB
Restore options : Perform database recovery - FALSE
Restore database file only - TRUE

[Minor] From: OB2BAR_E2010_BAR@exchangeserver.domain.tld "MS Exchange 2010 Server" Time: 21.08.2014 09:26:30
Getting the restore information from IDB and creating the restore chain failed for database DB2(30ae2b6b-df08-4ed1-a030-a70dbae354a6).

[Critical] From: OB2BAR_E2010_BAR@exchangeserver.domain.tld "MS Exchange 2010 Server" Time: 21.08.2014 09:26:30
No mailbox database copy can be selected for restore/instant recovery.

[Normal] From: RSM@backupserver.domain.tld "" Time: 21.08.2014 09:27:09
OB2BAR application on "exchangeserver.domain.tld" disconnected.

============================================================================
Session failed!
============================================================================

The session I tried to recover was 2014/08/01-06, the session that was chosen by Data Protector for recovery was 2014/08/01-03. To make the long story short: You can fix it with a site specific path for Data Protector 7.03. Log a call at the HP Support and ask for SSPNT700_038. Plase note that you need a valid HP Software Support contract to get this patch! The patch delivers fixes for the three defects QCCR2A51280, QCCR2A53555 and QCCR2A46724. The patch is delivered as a ZIP file and contains binaries and libraries which has to be installed on the Cell Manager and the Exchange server. The patch contains files for Windows on x64, HP-UX 11.23, 11.31 on IA64, HP-UX 11.23, 11.31 on PA RISC and Linux on x64. When running Data Protector on Windows, you have to replace the following files:

On the Exchange server

e2010_bar.exe
PSHAPI.dll
vssbar.exe

On the Data Protector Cell Manager

asm.exe
bsm.exe
csm.exe
dbsm.exe
libob2eadm.dll
libob2ecdb.dll
libob2ecmn.dll
libob2emmdb.dll
mmd.exe
msm.exe
rsm.exe

You have to stop the Data Protector services on the Cell Manager and the Data Protector Inet service on the Exchange server before you can replace the files. Make a backup of the files before you replace them. After the file replacement start the services and try the restore again. In my case the restore didn’t worked after applying the patch: It failed with the same error. I opened a case at HP and after a few day I got the notice, that lab engineering was involved in the case. Short after that notice, the support sent me two files (QCCR2A54842_TM1) that I had to replace on the Data Protector Cell Manager (libob2ecdb.dll & libob2ecmn.dll). Both files were part of SSPNT700_038, so you can interprete this as a patch for a patch. ;) This patch did the trick and the restore was successful. The root cause was, that a database query returns the wrong session for the recovery. So if you face the same problems, ask HP for the site-specific patch. If the problem remains, ask for QCCR2A54842_TM1.

Users on Exchange 2013 can’t open public folders or shared mailboxes on an Exchange 2007/ 2010

This posting is ~9 years years old. You should keep this in mind. IT is a short living business. This information might be outdated.

When moving users to Exchange 2013 it can happen, that they can’t access public folders housed on the old Exchange 2010 or 2007 server. The same can happen to shared mailboxes (mailboxes with Full Access permissions). The users are constantly prompted for credentials or they get this message:

Cannot expand the folder. Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance.

This can be a huge problem during a migration. Microsoft described this in KB2834139. This error is caused by a misconfigured Outlook security setting, called “Logon network security”. If you experience this issue, check the “Logon network security” setting. If it’s set to “Anonymous Authentication”, then you experience the in KB2834139 described problem. Otherwise you have another problem. Check the “Logon network security” settings in your Outlook client. I took this screenshots from a Outlook 2013, but it looks the same in Outlook 2010. With this setting you will have a problem:

Patrick Terlisten/ www.vcloudnine.de/ Creative Commons CC0

With one of these settings, it will work.

Patrick Terlisten/ www.vcloudnine.de/ Creative Commons CC0

Patrick Terlisten/ www.vcloudnine.de/ Creative Commons CC0

You can change the setting and try the access to a public folder or shared mailbox. If you can access the public folder or shared mailbox, then you have to change some settings on the Exchange Server 2013 Client Access Server (CAS).

Open an Exchange Management Shell:

[PS] C:\windows\system32>Get-OutlookAnywhere -Server exchange2.testing.local | select *external*,*internal*

ExternalHostname : mail.terlisten-consulting.de
ExternalClientAuthenticationMethod : Negotiate
ExternalClientsRequireSsl : False
InternalHostname : exchange2.testing.local
InternalClientAuthenticationMethod : Negotiate
InternalClientsRequireSsl : False

[PS] C:\windows\system32>Get-OutlookAnywhere -Server exchange2.testing.local | Set-OutlookAnywhere -ExternalClientAuthenticationMethod NTLM
[PS] C:\windows\system32>Get-OutlookAnywhere -Server exchange2.testing.local | Set-OutlookAnywhere -InternalClientAuthenticationMethod NTLM

[PS] C:\windows\system32>Get-OutlookAnywhere -Server exchange2.testing.local | select *external*,*internal*

ExternalHostname : mail.terlisten-consulting.de
ExternalClientAuthenticationMethod : NTLM
ExternalClientsRequireSsl : False
InternalHostname : exchange2.testing.local
InternalClientAuthenticationMethod : NTLM
InternalClientsRequireSsl : False

I would recommend to execute “iisreset” after changing the settings. Please note, that this interrupts the client access for a short moment! After a restart of the Outlook client or during the next Autodiscover, the client should get the correct settings and the access to the public folders and shared mailboxes should work.