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PRTG – Exception from HRESULT: 0x8024402

PRTG Keywords

Paessler PRTG System Monitoring

Sensor

Windows Update powershell

Problem/Error Message

Exception from HRESULT: 0x8024402C

Cause

This PRTG error occurs if the monitored server has a bad DNS address you will receive this error. This is typically a local Windows Active Directory domain.

Resolution

Ensure that all DNS addresses used on the monitored server are valid. You should do this in the DNS Server used by your Active Directory system. This may be present if you recently changed the IP address of the server and dynamics registration is not working properly.

Sometimes you may get a related error:

Timeout caused by wait for mutex (code: PE035)

Official PRTG Logo

Related Links

Managed Services
System Monitoring

 

 

 

 

For more information, visit the link below:

https://www.paessler.com/

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HOWTO: Upgrade firmware on Sennheiser OfficeRunner

Sennheiser OfficeRunner Sennheiser OfficeRunner Official Website photo

 

 

It can sometimes be difficult to figure out how to update your firmware when working with a Sennheiser OfficeRunner headset but it’s really quite simple once you know the steps.

  1. Plugin the headset base to your computer using a USB cable
  2. Download and install the Sennheiser HeadSetup software.
  3. Right-click the new HeadSetup tray icon and select Open
  4. Click the Updates tab
  5. Click the Check for update button.

That’s it!

For more information about how Acumen can help you find more solutions like this one, visit our About Us page.

http://www.officerunner.com/

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Zabbix frontend shows “zabbix server is running” No

Zabbix Problem & Solution 

Zabbix Official Logo

 

This occurs when you confirm that the service is running, but the frontend still won’t show server is running.


Found that turning off SELinux with setenforce 0 would fix the problem, so it is clearly SELinux related. The problem is that by default, SELinux prevents apache/php from connecting to network ports, even on localhost. To fix this, you must allow the SELinux rule: httpd_can_network_connect.


Zabbix Solution


sudo setsebool httpd_can_network_connect on

 sudo may not be necessary in your environment

sudo getsebool -a | grep httpd

 look for httpd_can_network_connect –> on

sudo setenforce 1

 This ensures that SELinux is running.


Do NOT just turn off SELinux. It is very effective at protecting your machine from attack.

We can provide assistance for your project. Please see our Linux consulting pages.

For more information, visit their Official Site.

https://www.linux.org/

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iPhone ARP Requests Flood LAN

iPhone

Recently a client was complaining of network issues (the internet was down). Upon further investigation I realized that no one was getting an IP address even though the links were up between my switches and DHCP server. I could set the IP statically but still wasn’t able to ping anything on the network. After verifying that the switches were working properly and the link between them was up we fired up Wireshark. This network, like a lot of networks, was a mix of WLAN and LAN clients. When we captured packets on just the WIRED network everything seemed fine, we would capture an average of about 20 packets per second. When we plugged in the switch that handled the WAPs the laptop running Wireshark simply stopped responding. We unplugged the switch with the WAPs and gave the laptop some time to process what had happened.

Someone’s iPhone was sending about 1,000,000 ARP requests every 5 seconds for a router that didn’t exist on this network. It seems that this person with the rogue iPhone had the a similar network at home and was desperately looking for, what it thought, was the default gateway. This is obviously an error with the iPhone. So, we tracked Cam down, disabled the WLAN card and assumed the problem was solved. Just for grins we ran Wireshark again only to find another iPhone that was doing the same thing. We decided to deny all iDevices a valid DHCP address to protect the integrity of the network by going to Windows DHCP and creating a deny list with a wildcard MAC that encompassed every iDevice.

Another interesting thing about this problem was that the iPhones were able to access the internet without delay while other devices were rendered useless by the flood of broadcasts. It’s also important to note that this solution does not help the network if the iPhone somehow gets assigned a static IP.

F0:DC:E2:xx:xx:xx is the OUI for the iPhone 4s that needs to be blocked.

 

For information about how Acumen can help you with problems like this one, visit our About Us page.

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Sonicwall Gateway Antivirus Causes Slow Downloads

Sonicwall

HOWTO: Speed up Sonicwall Downloads

We found that our Sonicwall would cause all downloads to start very fast, slow down quickly, and eventually stop. This occurred with major corporate download sites. The download went to low KB/s before dying. A download time estimate would indicate hours and days remaining.

We discovered that turning off the gateway antivirus allowed normal download speeds. However, because we want the benefit of the gateway antivirus, we would enable and disable the entire gateway antivirus security system.

This was very burdensome so we found that it could be resolved by:

      1. Login to your SonicWall device.
      2. Change the end of the url from main.html to diag.html
        1. You will see: Internal Settings – to be used only at the direction of Technical Support
        2. Change Security Services settings:
          1. Check Enable enforcement of a limit on maximum allowed advertised TCP window with any DPI-based service enabled.
          2. Change the value of Set a limit on maximum allowed advertised TCP window with any DPI-based service enabled (KBytes) from 64 to 512.
        3. Change Routing and Network settings:
          1. Check Enable TCP packet option tagging.
          2. Check Fix/ignore malformed TCP headers.
          3. Check Clear DF (Don’t Fragment) Bit.
        4. Go to the top of the page and click Apply.

Downloads will now function at full speed.

Looking for help with your Firewalls? We provide a full range of services including SonicWall, Barracuda, and McAfee Sidewinder. Visit Our Firewall Site or call toll free: 314.333.3330

For more information on Firewalls, visit the link below:

https://www.microsoft.com/en-us/safety/pc-security/firewalls-whatis.aspx

Keyword: Gateway antivirus St Louis

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Problems with Hosted Network

Known Personal Area Network / WiFi Sharing problems:

Connectify

Windows has encountered an error initializing hostednetwork. (CF001006)

Virtual Router Error

netsh wlan start hostednetwork
The hosted network couldn’t be started.
A device attached to the system is not functioning.

Cause

The problem is caused when VMware Virtual Ethernet Adapter for VMnet1 / VMnet0 (from VMware Workstation) are active.

Resolution

  1. Disable all VMnet virtual adapters.  Restart computer.
  2. Change the Wifi mode from Wi-Fi Access Point to something else. Change it back. This alters the hostednetwork settings.

Related problem

Internet Connection Sharing

SharedAccess_NAT 34005
The ICS_IPV6 was unable to allocate bytes of memory

ShareAccess_NAT 34001

The ICS_IPV6 failed to configure IPv6 stack.

Network Resolution

Try changing HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters\DisabledComponents (DWORD) to either 0x00000000 or 0xFFFFFFFF.

0x00000000 to enable all IPv6 functionality

0xFFFFFFFF to disable all IPv6 functionality

See our Services Page for more information!

For more information on VMWare, visit the link below:

https://www.vmware.com/

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Heartbleed Exploit

HeartBleed is a newly found OpenSSL exploit. It has been getting a lot of attention in the last few weeks because it leaves a large security hole on the majority of encrypted websites on the internet.

When accessing a secure Server that is using OpenSSL your computer will request a “Heart beat” to verify that there is a active connection to the server. This is accomplished by sending a piece of data of a specific size to the server to which you are connected and requesting that it be sent back to your computer.

The problem is that with this vulnerability someone can send a heartbeat request to a server but claim that the heart beat request is much longer than it actually is. The server will just assume that the the size of the request is accurate. And instead of sending back just the response, it will send back the response along with more information that is currently stored in the Servers buffer until it is the size that the original message claimed to be.

This is a very dangerous exploit that allows a attacker a look into the the servers buffer and see possible usernames and passwords among other things. Luckily the majority of Large companies like Google, Facebook, or banks had this patched as soon as this issue went public. It is very important that servers that send information over the internet have this exploit patched, because if they do not secure information on the server could be compromised.

We recommend you change your passwords for any important account, like for your bank or email. And verify that any server you own is patched as soon as possible.

Here is an Excellent video on the subject

Please contact our Network Support Team or call today at 314.333.3330 if you need help.

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TinyGrab: A free alternative to Droplr

Droplr Alternative 

Droplr Alternative

Droplr

A popular screen-grabbing tool that allows you to quickly take a picture of a selected part of your screen and automatically upload it to the web, allowing you to instantaneously share screenshots with colleagues. However, they recently have removed their free plan. We wanted to explore free alternatives before switching over to a Droplr paid plan. After a little research I found TinyGrab, an alternative to Droplr, which offers all of the features we need with a number of features on our “wishlist”.

Features:

  1. Automatically uploading selected-area screenshots to the web
  2. Automatically put the URL for the screenshot in the clipboard
  3. Screenshot mode triggered with hotkeys
  4. Uploading to a 3rd party hosting service
  5. Option to upload to our own sites using SFTP/FTP

To use:

TinyGrab, the first step is to register and download the software. Once it is installed, you can change your upload destination using the TinyGrab preferences. You can either upload to TinyGrab’s hosting server, or specify an FTP/SFTP connection and file destination to upload to your own hosting server.

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Chrome Full Screen Alt-Tab Closes Window

Our computer support team noticed an annoying bug in the latest version of Chrome. When trying to view full screen windows for streaming applications or just in general. Normally when in Full Screen view a Windows user can press Alt-Tab to switch to another window. With the new version of Chrome this causes the Full Screen window to close. Arg. Google is aware of the problem and promises to fix it with the next update.

Solution

A temporary workaround is to install a Full Screen tool. It’s relatively simple and a handy extension for when you want to use Full Screen with an application that doesn’t have a button to do so. Here are the instructions

  1. Start Chrome Normally
  2. Click Customize Chrome button in the upper right corner of the browser.
  3. Choose Settings.
  4. Click Extensions in the upper left corner of the window.
  5. Scroll to the bottom and click Get More Extensions
  6. Type “Fullscreen Anything” in the search
  7. Click + Free next to the Fullscreen Anything Extension
  8. Click Add
  9. Close and Restart Chrome
  10. Navigate to whatever site you wish to view Full Screen and click the Fullscreen icon in the upper right or from the drop-down menu.

I hope that alleviates a frustrating problem. I know it did for me.

See our Computer Support Pagefor more information on desktop support and computer productivity.

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