Microsoft Exchange and Active Directory Blog
I have already written about DKIM in conjunction with Sophos UTM here. Here is an article about Exchange and DKIM. Mails can receive a DKIM signature directly on the Exchange server, so an additional AntiSPAM solution that adds the DKIM signature is not necessary. To add DKIM signatures directly on the Exchange ... Read more
I have already written about this problem here: OWA and ECP deliver: server error in the application. However, the problem that OWA and ECP are no longer accessible after an update seems to occur quite frequently. At least I receive mails on this topic from time to time after the release of CUs. A reader has now kindly ... Read more
This year is a milestone birthday, as this site has now been in existence for 10 years. This birthday is being celebrated with a proper clean-up and a new design. I have implemented the following optimizations and improvements in the last few days: Disposed of old data (deleted thousands of corpses from the web server) Deleted 6 plugins that were obsolete Database ... Read more
If user accounts are synchronized using Azure AD Connect, no Microsoft 365 (formerly Office 365) license is assigned by default. In the default setting, a corresponding license must therefore be assigned manually so that the users can use the Microsoft 365 services. However, this process can also be carried out automatically. So that users are automatically assigned a Microsoft ... Read more
In January of this year, I reported on free S/MIME certificates from WISeID. Unfortunately, I have since discovered that newly requested certificates from this CA are no longer considered trustworthy. I noticed this when I requested a new 1-year certificate from WISeID. The CA still issues the certificates, but ... Read more
Sophos has released the update for the UTM to version 9.703 in a bug-fixed version. The update initially caused various serious problems and was withdrawn by Sophos. The update is now available with the version number 9.703-3. This update is intended to fix the following problems: [NUTM-9381]: [Access & Identity] WebAdmin user getting an error while ... Read more
A reader recently told me about a problem with the Sophos UTM web application firewall. Due to the Corona crisis, many of the employees have moved to the home office and have since been using more connections to the Exchange server, which are protected by the WAF of the Sophos UTM. So after there was a higher load on the UTM during the day ... Read more
On several Windows 2019 servers, I have already had the problem that the PowerShell module "Posh-SSH" only returns an error message when establishing an SSH connection. I had this problem with Windows Server 2019 and the Posh-SSH module in version 2.2. Here is a quick tip on how to fix the problem. The error message is as follows: ... Read more
Who isn't familiar with the evil "Reply all" function in Outlook? An important piece of information is quickly sent to the whole company, and then there's a flood of replies because the recipients use the "reply all" function: Depending on the size of the organization, such a flood of emails can generate a few million emails and thus ... Read more
As already announced here, this is the first article on the topic of Exchange Server Monitoring. This article is about the PRTG software from Paessler. PRTG has been on the market for quite a long time and I would classify it as a "classic" monitoring tool. PRTG is therefore well suited for monitoring hardware, ... Read more
