You may find that when doing decryption on a Palo Alto Networks Next Generation Firewall that images in Slack channels are not displayed or are only shown in a very low resolution – in addition images cannot be uploaded. When inspecting the HTTP error messages in your browser a 503 response may also be seen.
To top off the issue you may also see that User-ID isn’t mapping traffic from the Slack desktop application against the traffic which negates any User-ID based decryption exception you might have.
While helpful the Slack connection test tool at https://my.slack.com/help/test also doesn’t appear to throw any errors.
To fix this issue you need a decryption exception custom URL rule for the files.slack.com domain (which fixes viewing images) along with the base domain for your Slack tenancy (fixes uploads). This domain can be found by clicking the drop down in the top left corner of the Slack client.
If you have multiple Slack tenancies then you will need an exception for each one.
As always when making exceptions for your decryption policy please consider how it might degrade your ability to detect malicious usage of the network – in this case the sharing of files with unknown payloads.
For more information about Slack network usage visit: https://slack.com/intl/en-gb/help/articles/360001603387-Manage-Slack-connection-issues.
XML: The returned XML does not match the expected schema. (code: PE233) — JSON: The returned JSON does not match the expected structure (Invalid JSON.). (code: PE231)The cause is the default encoding from PowerShell is UCS-2 LE BOM as shown in Notepad++ below. The fix is simple in that when generating your REST configuration append -Encoding utf8 at the end of the Out-File command. I’ve also seen this apply to a few other situations when using PowerShell to output some form of text – in particular feeds for Palo Alto Networks Next Generation Firewalls.
It’s a bit of an odd situation but sometimes you might want to take information from a cloud service in this case Cortex XDR from Palo Alto Networks and drag it into an on premise logging service. This guide will have a look at how to get this log data in as well as parse it such that you can break out the individual fields in the log entry.
In looking at the documentation it appears that the logs are in the Comment Event Format (CEF) but are then wrapped up in syslog for transmission. Although Graylog can absorb CEF directly this additional layer of syslog means we have to take in the syslog and then send the event messages through a processing pipeline in Graylog to extract the CEF data.
So onto the guide – which assume you are familiar with the operation of the Cortex XDR management console and Graylog (shown version is 3.3), for simplicity the code snippet you’ll need is also shown below from GitHub.
A handy trick I learnt recently from this video (ICX Serial Console Server with Raspberry Pi by Terry Henry) which I’ve condensed into this screenshot guide. In short the ‘screen’ command in Linux can be used to turn any device into a serial console server – very handy if you need ‘out of band’ access to the management console of devices. This can be very handy for Firewalls/Routers/Network Switches where a misconfiguration (and forgetting to set a rollback) can lead to the administrators network connection to the device being cut off.
This guide assumes you have some experience of using the Raspberry Pi (although this will work on many other types of hardware) and Linux.
If you are looking to build out Zone Protection Profiles on your Palo Alto Networks Next Generation Firewall then it can be handy to know just what your connections per second metrics look over time for each zone. Quite lucky Palo Alto Networks have a little (although not entirely descript) guide on where you can get this data – https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/zone-protection-and-dos-protection/zone-defense/take-baseline-cps-measurements-for-setting-flood-thresholds/how-to-measure-cps.html.
With that information in hand it was just a matter of time before working out how to collect this data through PRTG so do follow on with the screenshot guide to find out how!
[rowidentifier] Connections Per Second
Not meant as a complete in depth guide but certainly enough to point you in the right direction here’s my list of the most commonly seen (from my point of view) HPE Aruba (e.g. the 2540, 2930F, 5400R series) fibre optics and their respective part numbers:
The format is effectively <Speed> <Fibre Type> <Maximum Range> – <Part Code>
1Gbit Multi Mode 500m – J4858D
1Gbit Single Mode 10km – J4859D
10Gbit Multi Mode 300m – J9150D
10Gbit Single Mode 10km – J9151E
In configuring the Microsoft Intune Certificate Connector and attempting to issue certificates to your client via Intune you might run into the error message below.
IssuePfx – COMException: System.Runtime.InteropServices.COMException (0x80094800): The requested certificate template is not supported by this CA. (Exception from HRESULT: 0x80094800)at CERTENROLLLib.IX509CertificateRequestPkcs10V2.InitializeFromTemplateName (X509CertificateEnrollmentContext Context, String strTemplateName)
at Microsoft.Management.Services.NdesConnector.MicrosoftCA.GetCertificate (PfxRequestDataStorage pfxRequestData, String& certificate, String& password)
Failed to issue Pfx certificate for Device ID 24c2445e-6cd2-4629-a942-081bdaca9b12 :
In short when configuring the certificate name to be used you’ve probably entered the ‘Template display name’ instead of the ‘Template name’ – note the difference in the screenshot where the template name doesn’t include any spaces.
Given the complexity of this feature I’ve found the guide at this link really handy in setting it up in the past:
The default graph options in PRTG (Setup > System Administration > User Interface) for extended periods of time (e.g. over 10 days) will display the average over a set period (e.g. 1 hour) – while this may be ideal for some data on occasion you may want to display the maximum or minimum value for the data over that period.
The example below shows just how much this can change the graphical representation of the data with the ‘max’ value when averaged as 48% while this climbs all the way to 53% when the graph purely displays the maximum values.
To change this display of data hop into the channel settings for the sensor and follow the screenshot guide below:
In looking to keep occupied with the current pandemic going on I’ve taken my Microelectronics projects to a new level and have over the past few weeks kicked out a series of soil moisture sensors which are powered by battery (18650) with a small solar panel keeping them topped up.
As the battery charges/discharges the voltage changes and moves outside of the acceptable ranges for the little ESP32 MCU, here a load drop out voltage regulator like the Microchip MCP1700 comes into play by ensuring that the controller is fed the right voltage all the time. In researching this project I’ve come across a fair few articles which mention the regulator is only ‘stable’ or ‘the supply is smoothed out’ with a set of capacitors in line. Just to test that out I hooked my multimeter up to the MCP1700 without the capacitors and lone behold the wrong voltage is being kicked out. Put the capacitors in line and everything works as expected.
There does appear to be a discrepancy (1uF vs 100nF) between the capacity of the capacitors in the datasheet and the article (and indeed I’m having occasional issues with controllers resetting due to what appears to be a power problem) but for now things are working well enough.
So after realising that my desktop PC has been running in BIOS mode (how 1970s and probably the result of multiple clones from HDD to 10k HDD, to 10k HDD in RAID0 to SSD and to another SSD) and with a free weekend I thought it was time to have a look at the MBR2GPT tool.
However in running the validate phase I was getting the error message:
Disk layout validation failed for disk 0
After following through a few red herrings on the internet I had a bit more of a dig into what the tool was up to and it appears that one of the first steps is to shrink the OS partition.
It appears that the fix is actually to preempt this and shrink the OS partition yourself (I reduced it by about 1GB – which made sense as one of the new partitions goes right in at the end of the disk), given these kinds of steps should only be performed by a person who knows what they are doing and understands the implications I won’t go into any detail as to how to do this other than providing the screenshot below.