XenServer: Unknown Error Occurred Connecting with XenCenter

When connecting to XenServer 5.5 from XenCenter on up to date Windows devices, you get an Unknown Error. To fix this, we need to generate a stronger SSL certificate. The logs below show the errors and locations to verify that this is the issue.

I couldn’t find all of this information easily consolidated into once place and hopefully this will save someone time if they come across the same issues.

XenCenter Logs

Location: %appdata%\Citrix\XenCenter\logs\XenCenter.log

2017-10-17 13:05:08,154 DEBUG XenAdmin.Network.XenConnection [Connection to xxx.xxx.xxx.xxx] - XenConnection: trying to connect to
2017-10-17 13:05:08,661 DEBUG XenAdmin.Network.XenConnection [Connection to xxx.xxx.xxx.xxx] - The request was aborted: Could not create SSL/TLS secure channel.
2017-10-17 13:05:08,661 WARN  XenAdmin.Network.XenConnection [Connection to xxx.xxx.xxx.xxx] - XenConnection: failed to connect to The request was aborted: Could not create SSL/TLS secure channel.
2017-10-17 13:05:08,661 DEBUG XenAdmin.Actions.Action [Connection to xxx.xxx.xxx.xxx] - The request was aborted: Could not create SSL/TLS secure channel.

(Source: Citrix: XenCenter Event Log)

XenServer Logs

Location: /var/log/secure

Oct 17 13:06:29 xen-105519 stunnel: LOG5[15145:3085974416]: xapi connected from xxx.xxx.xxx.xxx:55170
Oct 17 13:06:29 xen-105519 stunnel: LOG3[15145:3085974416]: SSL_accept: Peer suddenly disconnected
Oct 17 13:06:29 xen-105519 stunnel: LOG5[15145:3085974416]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket

(Source:Xencenter 6.5 and 7 “unknown error” while connecting to XenServer 5.6.0)

Fix :

Through SSH or Console Access do the following
Verify the key is 512

openssl x509 -in /etc/xensource/xapi-ssl.pem -text

Because the file that generates it is read only, create a copy in the temp directory.

cp /opt/xensource/libexec/generate_ssl_cert /tmp

Use vi to edit the new file.

vi /tmp/generate_ssl_cert

Update the following line to look like the one below it by pressing i to insert text.

openssl genrsa > privkey.rsa
openssl genrsa 1024 > privkey.rsa

Press escape followed by k, then type !wq to write changes to the file and quit without prompting.

Backup the existing cert.

cp /etc/xensource/xapi-ssl.pem /etc/xensource/xapi-ssl.pem.backup

Stop the xapissl service.

/etc/init.d/xapissl stop

Generate the new SSL cert.

/tmp/generate_ssl_cert /etc/xensource/xapi-ssl.pem ‘hostname -f’

Start the xapissl service.

/etc/init.d/xapissl start

(Source: WebbosWorld: XenCenter Could not create SSL/TLS Secure Channel)

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PowerShell: Disabling and Moving Inactive Users

While this isn’t my cleanest work, it did the job fairly well.

Also, I assume you’ve already added the Active Directory module, I believe command below will add it.

import-module activedirectory

This script will go through an OU, searching it’s contained OU’s, find inactive users then disable and move them into their own ‘Disabled’ sub OU.

This comes in handy when you have a bunch of client sites that are organized and you want to maintain organization.

Foreach ($i in (Get-ADOrganizationalUnit -Filter * -SearchBase "OU=MyOU,DC=mydomain,DC=local" -SearchScope OneLevel | foreach { $_.DistinguishedName })){
    Echo "-------------------------------------------"
    Echo $i
    Echo "-------------------------------------------"
    ForEach ($xx in (Get-ADUser -SearchBase $i -Filter {LastLogonTimeStamp -lt $time -and enabled -eq $true} -Properties LastLogonTimeStamp)){
        Echo "Disabling User"
        Echo $xx.Name
        Disable-ADAccount -Identity $xx.ObjectGUID
        Echo "Moving User"
        $DisabledPart1 = "OU=Disabled,"
        $DisabledOU = $DisabledPart1+$i
        Move-ADObject -Identity $xx.ObjectGUID -TargetPath $DisabledOU
    Echo "-------------------------------------------"

Below is a script that creates the ‘Disabled’ OUs.

Foreach ($i in (Get-ADOrganizationalUnit -Filter * -SearchBase "OU=MyOU,DC=mydomain,DC=local" -SearchScope OneLevel | foreach { $_.DistinguishedName })){
 echo $i
 New-ADOrganizationalUnit -Name Disabled -Path $i -Description "Disabled Accounts" -PassThru


I combined everything into a PowerShell application as seen below and can be downloaded here.

Note: This application will only search through enabled accounts.

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Terminal Server Gateways and PCI Compliance

Before starting, every Windows 7/Server 2008 R2 OS will need to have a specific patch (KB3080079) to be able to use TLS 1.1+ to connect to the Gateway properly after following the directions below.

To begin, download the IISCrypto software from Nartac onto the gateway server.

Upon opening, accept the agreement if it appears.

Click on the Templates section.

Select “PCI 3.1” in the drop down.

Click Apply.

Reboot the server.

It’s possible that at this point you might encounter and inability to connect and you’ll get the following error in the event log.

A fatal error occurred while creating an SSL client credential. The internal error state is 10013.

To fix this error, open the Control Panel, click Administrative Tools, and then open Local Security Policy.

In Local Security Settings, expand Local Policies, and then click Security Options.

Under Policy in the right pane, double-click System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing, and then click Enabled.

You may or may not need to run gpupdate /force

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