The ramblings of a computer geek
Emails are made up of a header and body, the body may be HTML or plain text, and any attachments are encoded within the body of the email for it to be sent. We have applied limits to our email infrastructure to reduce load, bandwidth, and disk space but also to protect recipients of our […]
More...The lowly Format command provides some simple, yet fairly effective data destruction for hard disks that you have on your machine. Although this technique may not be suitably effective for all data destruction requirements, it is fairly thorough in the destruction of data on a disk; such as one you wish to reuse for another […]
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We have a number of 2 node DAGs which provide our Microsoft Exchange 2016 service. Being a 2 node DAG a file share witness server is in place. We had a datacentre event that took out one of the nodes and the witness server, rendering the one of the DAGs unhealthy and a second in […]
More...We run a number of Microsoft Exchange 2016 server (yes I know we need to upgrade), these consist of four, two node DAGs with a pair of shared witness servers. For the purposes of this explanation however, we have a two node Microsoft Exchange 2016 DAG, with a single DAG Witness Server (File Share). Situation […]
More...Here’s a quick one, if you need to show a logon message to all users as they logon to a Terminal Server, for example to alert them to maintenance upcoming, there are a number of ways to do this, but this approach is a simple one. You would just add the a “Logon” script by […]
More...In certain situations the Exchange DAG witness can become a problem, this can occur during an upgrade or can happen if there is a network interruption. Although the DAG will continue to operate the witness is considered failed, which can cause odd behaviour in a failover scenario, as there is no quorum available for the […]
More...A long running issue, which I covered in my previous posts: https://geekmungus.co.uk/?p=3532 and https://geekmungus.co.uk/?p=3593, this should be taken as the current status of the problem and the resolution. Issue Following the patch: KB5021131 CVE-2022-37966, which was released November 8th 2022 we’ve continued to have some issues with Kerberos authentication to servers (devices) that use (and […]
More...Microsoft Exchange provides the capability to allow publishing of user calendars to the Internet, this is different from calendar sharing (which is typically internal, i.e. within our organisation). These instructions explain how to enable publishing by policy and how to apply it your own user mailbox. Calendar Publishing Policy Configuration on Microsoft Exchange These steps […]
More...NOTE: See https://geekmungus.co.uk/?p=3619 for the most up to date article! The following is my analysis going going deeper into my recent article: https://geekmungus.co.uk/?p=3532, hopefully this will give you a bit more context and information, but also allowed me to work through the issue in my head through documentation. Synopsis The patch KB5019964 changes what the […]
More...Within the Microsoft Exchange configuration you’ll see that there is an InternalURL and ExternalURL attribute for each of the key Microsoft Exchange Web Services, e.g. OWA, ECP, ActiveSync etc. Personally i’ve never really used these when they are different, but what it allows is for your internal and external URLs to access the services to […]
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