Notes

Found an old photo in my archive. On 2018-06-17, I saw a RMV ticket machine at the Oestrich-Winkel railway station, where the upper display failed and showed a Linux terminal (click to view larger version):

As I already said, the upper display normally shows advertisements and upcoming train departures.

Here, the display shows a LXTerminal with several error messages. This leads to the conclusion that these machines use a Linux system with the LXDE desktop environment.

You can say what you want about Cisco firewalls, but I recently discovered the "Not Used" button in Cisco ASDM. This button allows you to delete unused host objects. Nice :)

We faced a very strange behaviour with Citrix ADC (NetScaler). We use two NetScaler VMs to load balance two Citrix StoreFront servers. The StoreFront is SSL / TLS secured.

They suddenly stopped serving to serve the StoreFront web site, but without any explanation. Every status sign in NetScaler was green, the SSL certificate was not expired and since we use the freemium version, there was no license that could expire. The HTTP and HTTPS ports were open (tested using Test-NetConnection) and even the HTTP to HTTPS redirect worked. But the StoreFront page did not show up. Also the NetScaler log did not show that there was any config change or any other problem.

We tried to failover the NetScalers, to reboot them and to restore an older config file. But none of these measures did work. We also considered some NetScaler experts, but like us, they had no idea what was wrong.

The last idea we had was to restore the last night's backup of the VMs. Whatever the problem was, restoring the backup solved it. We really had no idea what the problem was, it didn't reoccur the last few days.

They are finally shutting down (german article) StudiVZ and MeinVZ. These were once the most popular social networks in Germany before Facebook became popular.

I wanted to create a dynamic distribution group in Exchange 2019 and wanted to include two kinds of users:

1. Users where the Company field has a specific value
2. Users that are members of a specific security group

The motivation was that our company has several sites. The Company states if a user is member of a site. And there are also users, that move between the sites. These users should be added using the security group.

To achieve this, I created the following recipient filter for the distribution group (indentation included for better readability):

(
    (
        (
            (
                (Company -eq 'My company')
                -or
                (MemberOfGroup -eq 'CN=my-group,OU=groups,DC=mycompany,DC=local')

            )
            -and
            (
                (
                    (RecipientType -eq 'UserMailbox')
                    -or
                    (RecipientType -eq 'MailUser')
                )
            )
        )
    )


    -and (-not(Name -like 'SystemMailbox{*')) -and (-not(Name -like 'CAS_{*')) -and (-not(RecipientTypeDetailsValue -eq 'MailboxPlan')) -and (-not(RecipientTypeDetailsValue -eq 'DiscoveryMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'PublicFolderMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'ArbitrationMailbox'))-and (-not(RecipientTypeDetailsValue -eq 'AuditLogMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'AuxAuditLogMailbox')) -and (-not(RecipientTypeDetailsValue -eq 'SupervisoryReviewPolicyMailbox'))
)

The import part is (Company -eq 'My company') -or (MemberOfGroup -eq 'CN=my-group,OU=groups,DC=mycompany,DC=local'). The long part at the bottom is the default filter.
There are some important things:

• You must specify the distinguished name for the group
• The users must be direct member of the group, nested groups do not work.

But hey, it works :)