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Ubiquiti USG VPN MTU/MSS problem

Today you find a solution when you face broken network streams between multiple site-to-site VPN’s. Environment Three locations Three Ubiquiti USG Three static IP’s Behind the scene Below you see the chart from my whiteboard to solve the problem. During debugging I figured out that the L2TP does not have any performance issues. The ppp0 interface had a MTU of 1280 after the connection was established. Beside the different MTU …

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Windows 10 – Calculator crashes with Event ID 1000

If your Windows Calculator crashes with Event ID 1000 and you find the error below in your Eventlog, here is the solution. Solution Open Apps & Features in the Windows settings Search for the calculator Open the advanced settings Reset the settings for the calculator Now you can use the calculator again.

oVirt Node 4.4 Gluster Installation failed with “Device /dev/sdb excluded by a filter”

Today I set up a new oVirt Cluster based on the oVirt Node 4.4 and a Gluster installation. The cockpit installation looked nice but failed with the following error: TASK [gluster.infra/roles/backend_setup : Record for missing devices for phase 2] *** skipping: [<SERVERNAME>] => (item={‘cmd’: ‘ test -b /dev/sdb && echo "1" || echo "0"; n’, ‘stdout’: ‘1’, ‘stderr’: ”, ‘rc’: 0, ‘start’: ‘2021-01-23 16:17:42.264991’, ‘end’: ‘2021-01-23 16:17:42.269580’, ‘delta’: ‘0:00:00.004589’, ‘changed’: …

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UniFi USG – VPN L2TP: Ignoring request to authentication address * port 1812 from unknown client

Problem Can not establish connection to UniFi VPN with L2TP Detail ssh to the USG sudo tail -f /var/log/freeradius/radius.log … Mon Jan 4 08:21:35 2021 : Error: Ignoring request to authentication address * port 1812 from unknown client port 37109 … Environment USG-3P UniFi Controller 6.0.43.0 Solution After a long try and error, search and fail and so on I found a little strange but working solution. Open the Radius …

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Use HP LaserJet 2100TN with macOS Big Sur (11.0.1)

Here you find a easy solution to use a HP LaserJet 2100TN with an JetDirect 600N extension to use as network printer. The LaserJet 2100TN from 1999 is still in use and works with latest macOS Update in 2020. Here you see a screenshot of the printer settings .. yes thats all 🙂

Plant monitoring v0.1

Today I describe a new project to monitor plants: How it looks like when it is integrated into Nagios. GitHub Repository: nagios_check_plant_sensor Table of contents 1. Hardware1.1. Plant sensor1.2. Raspberry Pi 3 Model B​2. Installation​2.1. Raspberry Pi 3 Model B​2.2. Install Python 3.8.*​2.3. Install check_plant_sensor​2.4. Find your sensor’s MAC​2.5. Test check_plant_sensor​2.6. Install NRPE​3. Configure Nagios​3.1. Nagios configuration​4. It’s done​ 1. Hardware 1.1. Plant sensor Manufacturer: WanfeiProduct: Flower Care TesterPrice (21.10.2020): …

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Ubiquiti EdgeRouter X initiate site-to-site VPN after remote site reboot

To establish a site-to-site VPN connection the remote site has to initiate a connection to the main subnet. Normally this is a good idea to bring up the connection but sometimes there is connection starting from the remote site. For example if you have on the remote site surveilance cameras system which has to connect to the main site it is not possible to initiate a VPN connection from the …

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How to access VNC in Safe Mode

Today I describe how to enable VNC on a remote machine which can be used in safe mode. Environment Windows 10 Pro 64bit TightVNC Workflow Connect with VNC to the remote machine Open an elevated command prompt REG COPY HKLMsystemCurrentControlSetservicestvnserver HKLMsystemCurrentControlSetcontrolsafebootnetworktvnserver /s /f Open msconfig Set safe mode with network enabled Reboot the machine Reconnect with VNC to the remote machine

LibreOffice: Automatically save documents

Below you find a solution how to automatically save documents, in case you forget to save your documents and leave the workstation and therefore they are not synchronized with your favorite cloud solution (or if some of your colleague are forget to save the files …). Environment OS: MacOS 10.15.3 and ArchLinux (21.2.2020) LibreOffice 6.3.4.2 Workflow Open the settings and change as you see below Close LibreOffice and reopen (IMPORTANT) …

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oVirt: DataAccessResourceFailureException

From one day to another the oVirt Management Webinterface broke with the Exception: org.springframework.dao.DataAccessResourceFailureException:Error retrieving database metadata; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.postgresql.util.PSQLException: This connection has been closed. After investigating the log file I found in “/var/log/ovirt-engine-dwh/ovirt-engine-dwhd.log” the following error: org.postgresql.util.PSQLException: ERROR: right sibling’s left-link doesn’t match: block 2 links to 1 instead of expected 4 in index “idx_vm_device_history_vm_id_type” Solution Thanks to Strahil N., …

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