Microsoft Exchange and Active Directory Blog
After renewing the Exchange backend certificate, frequent channel error messages may appear in the event log if the POP3 service of the Exchange server is used. The following two error messages may appear after the certificate has been changed: Source: Schannel Event ID: 36871 Level: Error Fatal error while creating the client credentials for TLS. The internal error status ... Read more
Microsoft today released new security updates for all Exchange Server versions that are still supported. The updates address a total of 3 vulnerabilities: CVE-2020-17083 | Microsoft Exchange Server Remote Code Execution Vulnerability CVE-2020-17084 | Microsoft Exchange Server Remote Code Execution Vulnerability CVE-2020-17085 | Microsoft Exchange Server Denial of Service Vulnerability As two of the vulnerabilities allow remote code execution, it is recommended to ... Read more
In a somewhat older article, I already mentioned InfluxDB, Grafana and Telegraf. Grafana makes it easy to create attractive dashboards for all kinds of systems. The three tools mentioned are often used for the dashboards, InfluxDB as a database for storing the metrics, Grafana and displaying the dashboards and Telegraf to ... Read more
I have just uploaded version 3.8 (code name Leslie). This is the first version that has a "code name" because Leslie (the Leslie) was kind enough to dig through the many lines of PowerShell code and found and reported some bugs. The following bug fixes are included in version 3.8: updatereport.ps1: The module showed the ... Read more
Last week there was a small raffle here in which there were 2 books to be won. The raffle has now ended and the winners have already been chosen. I have already notified the winners Stefan and Michael by e-mail. If one or both winners do not respond within a week, a new draw will be held, ... Read more
Yesterday, Microsoft released a new security update for Exchange Server 2013, 2016 and 2019. The update closes the vulnerability CVE-2020-16969. The vulnerability can be exploited with a specially crafted email, so the update should be installed promptly. The update is classified as "Important". Microsoft describes the vulnerability as follows: An information disclosure vulnerability exists in ... Read more
After a long time there is something to win again. MITP Verlag kindly sent me 4 books, which can now be won as two sets in a small raffle. First of all, many thanks to MITP for providing the books! To take part in this little raffle, all you have to do is ... Read more
A long time ago I updated the Exchange Certificate Assistant for the last time. The script uses POSH-ACME as a client to automatically request Let's Encrypt certificates, but there are problems with the script from time to time. However, since there is now a much better version that also supports Exchange Server (and other services), I will ... Read more
Today at the Ignite online conference, Microsoft announced the next version of Exchange, SharePoint, Project Server and Skype4Business for the second half of 2021. So the cat is out of the bag, there will be another Exchange Server version for on-prem use next year. A new Office version is also planned for next year. Read more
Originally I had given up the plan to write another white paper on the subject of "Exchange and certificates". However, there still seem to be very frequent problems with the configuration of certificates in connection with Exchange servers. There are already a few articles and scripts here, so now a comprehensive whitepaper on the subject will follow ... Read more
