Category Archives: Internet Explorer 8

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Watchguard XTM Firewall UTM Device – Cannot browse some sites and logs report GAV job open failed (failed to connect to scand at scand)

Cannot browse some sites and logs report GAV job open failed (failed to connect to scand at scand)

You may find that you cannot access or browse some websites when you are using a Watchguard XTM Firewall or UTM device and the GAV (gateway antivirus) is enabled.  When you review the appliance logs you see the following event logged GAV job open failed (failed to connect to scand at scand).  In this instance the anti-virus proces or component of the XTM device has probably crashed or stopped responding.

Resolution/Workaround:

You might be able to permantently resolve this issue by upgrading to a newer XTM OS i.e. 11.4.2 to 11.5.2 or you may simply need to apply the latest CSP release for the XTM OS build you are using i.e. 11.4.2 CSP9 (Service Pack).  Newer OS releases and Service Packs often included fixes for these sorts of GAV issue.

A workaround would be to schedule a reboot of your Watchguard XTM appliance, this will reset the GAV (gateway antivirus) and should allow pages to load correctly again.

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CPU Usage may increase to 100% while you are scrolling through a Web page in Microsoft Internet Explorer 8 or Microsoft Internet Explorer 9

CPU Usage may increase to 100% while you are scrolling through a Web page in Microsoft Internet Explorer 8 or Microsoft Internet Explorer 9

This can occur if the “Use smooth scrolling” option is enabled in “Internet Options” by default the “Use smooth scrolling” setting is enabled in Internet Explorer 8 and Internet Explorer 9.

To resolve the issue you just need to disable/untick the “Use smooth scrolling” option in Internet Explorer by following the steps below

  1. On the “Tools” menu in Internet Explorer, click “Internet Options” then click the “Advanced” tab
  2. Click to untick the “Use smooth scrolling” check box as shown in the screenshot below

The Microsoft knowledge base article KB 885355 http://support.microsoft.com/kb/885355

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Adobe Flash Player 11.2 Beta for Windows and Mac OS X

You can download and trial the beta release of Adobe Flash Player 11.2 using the following link

http://labs.adobe.com/downloads/flashplayer11-2.html

This beta release introduces multi-threaded video decoding and Flash Player background updates

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Remote Desktop Sessions Pause Or Exhibit Unresponsiveness – Lag Whilst Typing And Session Will Not Accept Mouse Inputs

Remote Desktop Services can be extremely useful, allowing users to access a terminal server or their company desktop computer from another location.  One very common complaint with RDP sessions is screen refresh delays and a delay when typing or trying to click on items using the mouse cursor.  It will appear to most that the session has become unresponsive for a period of 5-20 seconds, after this delay the session will return to normal for a period of several minutes before once again becoming unresponsive.  You may find that this issue becomes more apparent as more users connect to the specific terminal server in question and if all these users utilise several applications (i.e. Outlook, Word and Excel) together.

Causes for poor user experience when connected via RDP are varied but one of the most common is resource exhaustion or contention.  This in turn causes a delay in processing that appears as a pause or unresponsiveness.

Check that your computer or terminal server has sufficient Memory to cope with the current load.

The next thing to verify by using performance monitor is that the PhysicalDisk\% Idle Time is consistently high, that’s correct this should be 90-100% when the server is not very busy.

It is worth running performance monitor using the PhysicalDisk\% Idle Time counter whilst you are seeing the slowdowns, this will help identify if your hard disk or controller are causing contention and in turn the pausing or unresponsiveness.

If you do find that the “%Idle Time” keeps going very low then it’s time to consider some of the options below to help resolve the issue

  • Install a second drive or mirror set, move the Windows Page File to this second disk/array to reduce the load on the drive/array holding your operating system
  • Install additional memory into the computer or server, this will reduce paging to disk and will generally improve overall system performance
  • Migrate to or upgrade your existing RAID controller to a unit that had a Battery Backed Cache (Fast) or Flash Backed Cache (Newer – Faster) to significantly improve performance and alleviate the system
  • Migrate to faster hard disk drives, 7200, 10,000 or 15,000 RPM drives are amongst the fastest.  The SATA interface is slower than the SAS interface but is cheaper.  Try to invest in the fastest drives that you can to future proof the system and avoid future performance issues if you have to scale for more users.
  • Ensure that you have at least 20-25% free disk space on all partitions/drives
  • Defragment all drives on a regular basis to optimise read and write operations
  • A cheap solution for improving disk performance may be to turn on the Hard Disk Cache using “Device Manager” or in the event that you are using a RAID controller without a battery backed Cache module you will need to open the RAID Array Management Software and then enable Disk Cache within the management software as this feature will not be available within “Device Manager” in this instance.  Please note that this does have some risks and should be used with caution, you may loose data in the event of a sudden/unexpected loss of power to the system.  Consider using this option with a UPS and redundant power supplies to reduce the risk of power loss to the system.  As always ensure you have a reliable backup that is carried out at regular intervals.

Example – HP RAID Array Configuration Utility:

Example – Windows Device Manager: