FortiGate Sub Interfaces (VLAN Trunking)
Jan25

FortiGate Sub Interfaces (VLAN Trunking)

KB ID 0001772 Problem I was asked by a colleague at work the other day, can we replace the Cisco firewalls with FortiGate firewalls for a client? As a business we are heading towards Forti, but before I said yes I wanted to know what the firewall was actually doing before I said yes. On closer inspection the firewall in question didn’t appear to be doing anything too scary, but I did notice that the LAN interface was...

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Group Won’t Accept Mail From ‘Outside’
Jan10

Group Won’t Accept Mail From ‘Outside’

KB ID 0001771 Problem Exchange has been this way for a long time here’s me explaining this very problem with older versions of Exchange. If you create a ‘Group’, be that a Distribution Group, or a ‘Microsoft 365′ Group, the default setting is to NOT ALLOW mail from anyone outside your organisation. If you attempt to send mail to that group you will see errors like these; Errors; 550 5.7.133...

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Can you Use ‘Let’s Encrypt’ on Hybrid Exchange?
Jan07

Can you Use ‘Let’s Encrypt’ on Hybrid Exchange?

KB ID 0001770 Problem A few months ago I wrote an article about getting free exchange certificates with Lets ‘Encrypt’. And that still works peachy, I implemented it on my test Exchange 2019 server (in Hybrid mode) and all appeared well.  Some time later, (remember this is my test network so it’s not in production.) I noticed that mail was not getting forwarded from O365 to the on premises Exchange server. I’ve...

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Exchange Y2KK Bug
Jan04

Exchange Y2KK Bug

KB ID 0001769 Y2KK Problem Over the last couple of days the Exchange forums have been alight with the Y2KK bug, typically it affects Exchange 2016 and 2019 (though the chatter is, it actually effects any Exchange versions whose update version begins with 22… This is fine below, (it begins with 21..) Add-PSSnapin Microsoft.Forefront.Filtering.Management.Powershell Get-EngineUpdateInformation Y2KK Symptoms  Emails No Longer Being...

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Exchange ECP HTTP 500 Error
Dec22

Exchange ECP HTTP 500 Error

KB ID 0001756 Problem This infuriatingly happens to me a lot! Every time the fix is the same, (but is a little impractical). Essentially you attempt to log in to ECP (Exchange Admin Center), you a prompted for your credentials, then you just get a ‘500 Error”.     The website cannot display the page   HTTP 500  Most likely causes: •The website is under maintenance. •The website has a programming error. What you can try:  ...

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FortiGate HTTPS Error
Dec08

FortiGate HTTPS Error

KB ID Article Problem While attempting to connect to a FortiGate firewall (with Firefox over HTTPS) you may see this error; Secure Connection Failed An error occurred during a connection to {x.x.x.x} SSL received a record that exceeded the maximum permissible length error code : SSL_ERROR_RX_RECORD_TOO_LONG The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please...

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