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ONDREJ ŽILINEC – IT BLOG

Ondrej Žilinec – Cievo

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EXCHANGE PROBLEM AFTER 1/1/2022

January 2nd, 2022 Ondrej Žilinec No comments


Problem

Today I wanted to have day off, but customers with Exchange environments
(2013/2016 and 2019) started to have a problem with e-mails delivery. They have
started to receive following error in event viewer:

This event started to show couple minutes after 1.1.2022.

Messages stucked at queue and with error “Message deferred by categorized
agent”:

Solution

So Antimalware has problem with date “22010100009” and error says it’s “too
long”. It looks like Microsoft programmers use to record date 32b numbers and
now this value is over variable limits. I think there is will hotfix pretty
soon. Until hotfix we need to solve a problem. I just disabled Antimalware
engine running following powershell script:

& $env:ExchangeInstallPath\Scripts\Disable-AntimalwareScanning.ps1

and restart MSExchangeTransport service afterwards:

Restart-Service MSExchangeTransport

And that’s all folks 🙂


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Categories: Exchange, Microsoft Tags: excvhange, Message deferred by categorized
agent, problem, to long


WINDOWS 7 UNABLE TO CONNECT TO WIFI WITH WPA2-ENTERPRISE (802.1

October 28th, 2021 Ondrej Žilinec No comments


I have deployed WPA2-Enterprise authentication on network. Computer should use
computer certificate to authenticate to Wireless network. I deployed NPS server,
configured all requirements. Windows 10 didn’t have problem to connect to Wifi
network. Windows 7 computers have problem.

Problem

In eventviewer (Applications and Services
Logs\Microsoft\Windows\WLAN-AutoConfig) I found following error:

Network Adapter: Intel(R) Centrino(R) Advanced-N 6205
Interface GUID: {c2c428cb-76cc-4474-a043-33ce2bfe9f0d}
Local MAC Address: 60:67:20:a6:42:63
Network SSID: SECURE_WIFI
BSS Type: Infrastructure
Peer MAC Address: 34:1F:a2:AF:C8:1E
Identity: DOMAN\USER1
User: USER1
Domain: DOMAIN
Reason: Explicit Eap failure received
Error: 0x80074005
EAP Reason: 0x4005
EAP Root cause String:
EAP Error: 0x4005

Solution

Problem is very weird. When you install NPS server, NPS server will use
certificate to proof of identity. By default it uses certificate created from
Windows CA Template called Kerberos Authentication. This certificate has empty
attribute called Subject.



Windows 7 has problem that it doesn’t accept certificate with empty Subject
attribute. Other OS’s worked fine. Solution to make it work is to populate this
attribute into certificate. You can do it following way:

 * Go to Certificate Template console (use MMC, add snap in –> Certificate
   Templates) and change template called Kerberos Authentication.
 * Open properties of this template
 * Go to Subject Name tab
 * Change Subject name format to DNS name



Now go to NPS server. Open the Certificates MMC (Computer), go to Personal /
Certificates and right click in the details pane – All Tasks / request New
Certificate. Request new certificate from template Kerberos Authentication for
computer account:



After new certificate is installed under computer certification store, you can
find attribute Subject populated with DNS name of NPS server:



When certificate is OK, you can change certificate which should be used to proof
identity.

Let’s make new certificate work on NPS server. Open NPS console. Go to Network
Policies and open up your policy which handles 802.1x requests. Go to the
Constraint tab, Authentication Methods / PEAP and click on Edit.



The certificate expiry date now shown should tie in to the one you just created:



Now also Windows 7 will connect to wireless network with no problem and not
error event 🙂

That’s all fokls,




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Categories: Computer network, Microsoft, Windows Tags: 802.1x, certificate, eap,
failure, nps, radius, windows 7


VEEAM SERVER RENAME

October 28th, 2021 Ondrej Žilinec No comments


Problem:

Sometimes it happens that you need to rename server where Veeam server is
already installed. When you rename server you won’t be able to login into this
server. You get following error:

Failed to connect to Veeam Backup & Replication server:

No connection could be made because the target machine actively refused it IP
address.

Solution

You have to change server name to new new in registry:

 * open cmd and type regedit
 * go to registry \HKLM\Software\VeeaM\Veeam Backup and Replication and look for
   REG_SZ value called SqlServerName. Change it to new server’s name.

 * go to registry \HKLM\Software\VeeaM\Veeam Backup Catalog\ and look for REG_SZ
   value called CatalogSharedFolderPath. Fix it to point to new server’s name
   share.

 * restart whole server and you are all ready 🙂

Enjoy,


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Categories: Veeam Tags: backup, rename, server, veeam


WINDOWS PORT FORWARDING

November 3rd, 2020 Ondrej Žilinec No comments


I didn’t know that it’s possible in Windows TCP/IP stack make port forwarding. I
knew it’s possible in Linux using iptables. In windows we have powerful tool
called netsh.

Let’s have a example. Some service is listening on port TCP/10000. If I want to
make this service listen on other port than TCP/10000 and there is no
configuration to change I will use netsh to make it happen. Let’s look at
listening ports on TCP/10000 and TCP/20000:

netstat before netsh

We can see there is no port listening on TCP/20000. Let’s make a magic and run
command:

netsh interface portproxy add v4tov4 listenport=20000 listenaddress=0.0.0.0
connectport=10000 connectaddress=192.168.100.118

You cannot use loopback or 0.0.0.0 in connectaddress parameter. You can even use
remote server IP address in connectaddress parameter.

Let’s look at netstat commands:

netstat after netsh

If your command doesn’t work, please, check if service called IP Helper is
Running.

To see all configuration of portproxy settings just run following command:

netsh interface portproxy dump

netsh interface portproxy dump

To delete rule just run following command:

netsh interface portproxy delete v4tov4 listenport=20000 listenaddress=0.0.0.0

And that’s all folks,


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Categories: Computer network, Microsoft, Windows Tags: netsh, network, port
forwarding, Windows


WINDOWS UPDATE RESTART PROBLEM

November 3rd, 2020 Ondrej Žilinec No comments


Once upon the time I had problem with Windows Update. All updates got downloaded
and installed. When user click on button Restart Windows got error 0x80070005.

After couple minutes of debugging with Process Monitor I found out that process
called explorer.exe had problem with accessing directory
C:\Windows\System32\Tasks. That means that if you click on button Restart in
Windows Update, Windows doesn’t just restart system. It creates Scheduled Task
to reboot. Weird, but it does it this way.

So I have created GPO with security settings for directory
C:\Windows\System32\Tasks and allow BUILTIN\Users have Modify rights to this
directory.

And that’s the way we make it 🙂




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Categories: GPO, Microsoft, Quickie, Security, Windows Tags: 0x80070005, Access
Denied, Windows, windows updates


EXCHANGE 2010 PF NOT ACCESSIBLE FROM EXCHANGE 2016 MAILBOXES

August 22nd, 2019 Ondrej Žilinec 1 comment


Problem: When I do migration from Exchange 2010 to Exchange 2016 most of the
time I have problem with old style Public Folders hosted on Exchange 2010. When
you migrate user from Exchange 2010 to Exchange 2016 she cannot access Public
Folders hosted on Exchange 2010.

Solution: You need to setup Exchange 2016 environment to be able to proxy Public
Folders hosted on Exchange 2010. You need to create proxy mailbox which Exchange
2016 will use to proxy Public folders. Here are couple steps you need to do:

 * Create new mailbox:

New-Mailbox -Name PFMBX1 -Database {YOUR  EX2010 DATABASE NAME}

 * I preffer to hide this mailbox from other users

Set-Mailbox -Identity PFMBX1 -HiddenFromAddressListsEnabled $true

 * Set on Exchange 2016 server following proxying

Set-OrganizationConfig -PublicFoldersEnabled Remote -RemotePublicFolderMailboxes
PFMBX1

Now when Exchange 2016 users restart their Outlook clients they will see Public
folders hosted on Exchange 2010.

Have a nice day,


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Categories: Exchange, Microsoft Tags: exchange, migration, public folders


EXCHANGE 2010 TO EXCHANGE 2013/2016 AUTODISOVER PROBLEM

August 22nd, 2019 Ondrej Žilinec No comments


Problem: There is a known error in Exchange 2013/2016 when you migrate user’s
mailbox. After the migration is done use cannot access her new mailbox. It is
possible after some time (max 15 minutes).

Cause: This is caused by outdated data cached by Autodiscover process on
Exchange server. It’s called MSExchangeAutodiscoverAppPool.

Solution: You need to set application pool responsible for creation autodiscover
XML file to recycle more often. You can do Recycle manually from IIS console
after migration is done:

Manual Recycle

Or you can configure automatic recycling on specific condition. I most of the
time configure Recycling on every minute. When all users are migrated I disable
this rule:

Have a nice day,


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Categories: Exchange, Microsoft Tags: Autodiscover, exchange, problem


DECOMMISSION PROBLEM IN AD

January 30th, 2017 Ondrej Žilinec No comments


In long time I was asked to decommission one domain controller. It’s kinda
straightforward process. But, yes again, I had a problem. When decommission
process started I received error stated:”The operation failed because: Active
Directory Domain Services could not configure the computer account DC_ACCOUNT$
on the remote Active Directory Domain Controller DC2_ACCOUNT$: “Access
Denied.””.

 



 

I have checked my account and I was domain admin. My rights were alright.

Error “Access Denied” was interesting. Problem was checkbox called “Protect
object from accidental deletion” on domain controller object which denied system
to delete domain controller object:

 



To see this option you need to enable Advanced Features in Active Directory
Users and Computers (dsa.msa) console.

Have a nice day,


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Categories: Active Directory, Microsoft Tags: Access Denied, decommission,
domain controller


EXCHANGE 2010 VERSIONING

April 28th, 2016 Ondrej Žilinec No comments


From some update there is no relevant information about version in Exchange 2010
SP3. Let’s try it in Powershell:



It says it’s 123.4 build which should coresponds to plaint Microsoft Exchange
Server 2010 SP3 (Exchange Update Rollup numbers). This is not corrent
information, because those servers have UR installed.

Using EMC I can see:



Which are also incorrect information about server versions. I suppose it’s just
nicer output of Powershell cmdlet 🙂

Best way to find out it’s to use EMC console on server and use “About”:



You will get information which are correct:



It’s Update Rollup 11 for Exchange Server 2010 SP3.

It’s really bad that you cannot find Exchange version of all your Exchange
servers in one place (Powershell or EMC). Let’s hope they will fix it in new
Update Rollup 🙂

That’s all fokls for today.




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Categories: Exchange, Microsoft Tags:


QUICKIE: DFSR NOT WORKING

April 27th, 2016 Ondrej Žilinec No comments


Problem: One of our customer has about 30 locations across our country and they
wanted to use DFSR to replicate folder content to all locations. At each
location there is one Hyper-V host running Windows Server 2012 R2 OS with DFSR
installed. Each server has three disks – C:\, D:\ and E:\. I have configured DFS
Replication in DFS console, replicated AD across environment, and … and nothing
happened. DFSR didn’t do anything. It did NOT even create its own private
folders in “System Volume Information” folder. No error event in Event viewer.
DFSR was set to replicate folder on disk D:\ – didn’t work. I tried to replicate
directory on E:\ disk – didn’t work. So I tried to replicate folder on C:\ disk
– it did work 🙂



Solution: I enabled DFSR debug logging. There was no error mentioned, but what I
noticed was that disks D:\ and E:\ had same serial numbers and also same volume
IDs. It was weird. But after some discussion I found out that those two disks
were “copied” and “cloned” in Hyper-V environment. So that’s why they had same
serial numbers and volume IDs. I found out that it can be a problem. So I had to
change volume ID using Microsoft utility VolumeID. After I changed one disk
volume ID and rebooted system, DFSR started to work as expected.

So never do disk cloning. Or if you do, change at least volume ID for those
disks so Windows services don’t get confused. Looking into this problem took me
one and half day! Thank you Microsoft 🙂


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Categories: Microsoft, Quickie, Windows Tags:
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