0405119483 [email protected]
computer repairs networking
I was asked by a client to come and have a look at various Windows Networking problems they were experiencing. The client had a mix of Windows XP and 7 computers in a network extended by 2 switches and a Telstra 4G modem router.

The first problem was a marked decrease in file transfer speed when the client backed up large files from his machine to a Windows 7 machine they used as a file server. After performing the following tasks on the 2 relevant machines

  • Update drivers
  • Remove unnecessary Protocols eg IPv6
  • Remove Virtual Adapters.

I checked the networked adapter settings and found the

Speed & Duplex setting had been changed from Auto to 100 and therefore they were not connecting to their server at GigaBit speed. I also made the following changes

  • Enable a 9k Jumbo Frame on

and the transfer problem was resolved. What previously took one half hour was transferred in seconds.

The other problem was that Network Discovery was consistently failing and that all or most of their available shares were disappearing.

The client had 5 to 6 windows 7 machines with each machine having anywhere from 4 to 6 shares each which were used occasionally.  However they had one PC running Windows 7 Pro which they used as a  Server and which had 8 shares which were used consistently to store MYOB data, documents , graphics files etc.

Windows 7 file sharing requires one PC be the Master Browser so that all Network Discovery of available shares and PC’s occurs on the Master Browser. Which PC becomes the master browser is determined by an election process that occurs at startup.

I isolated which machines that could be the Master Browser by setting the registry key

  • \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \Browser\Parameters\isDomainMaster to True

on the server PC. I disabled all of the other PC’s from becoming a Master Browser except for one by setting the registry key

  • \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \Browser\Parameters\MaintainServerList to NO

I left the client to work in the hope we could more easily identify the problem should it arise again which of course it did. When Network Discovery failed again I could now at least identify that the problem was on the Master Browser.

As Network Discovery relies on the following services

  • DNS Client
  • Function Discovery Resource Publication
  • SSDP Discovery, and
  • UPnP Device Host services

And that the following ports need to be open

  • DNS Client requires port 53 be open
  • SSDP uses 1900
  • UPnP uses  5000

I dropped the firewall on the server and gave the client a tool called lanclient which conveniently lists all the PC’s with shares in a workgroup and which machine is the master browser.

When Network Discovery failed again it was clear there was an error on the Server as running the LanClient program produced no results.

After obtaining remote access from the client to the Server PC it was clear from the event logs that there was a recurrent error on this machine

  • The server was unable to allocate from the system nonpaged pool because the server reached the configured limit for nonpaged pool allocations.

The above error had been occurring nearly daily and was the cause of the discovery problem. The fix in this case is changes to the following registry keys.

Set the following registry key to 1.

  • HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\LargeSystemCache

and set the following registry key to 3.

  • HKLM\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\Size

What our Clients Say

Daniel G
Daniel G
Digby was a great help fixing a number of mistakes (and the effects of the same) I had unwittingly made with permissions on my laptop and communication between external drives. Would highly recommend!
Pancho Villa
Pancho Villa
I had my sons MAC book repaired by Digby. Digby was very thorough and professional in his approach and communication. He quoted a fair price and undertook the repairs on time. I would highly recommend.
Andrew Bruce
Andrew Bruce
Digby provided a high quality service in uograge my computer after backing up and reinstalling my data, folders and files. He met his time and cost quotes and the machine is fully up and operational. I cannot praise digby'd service too highly.
Inez McQuillin
Inez McQuillin
Thanks for the excellent service
Almas Nurlybekuly
Almas Nurlybekuly
Hi All, I do not usually write the reviews, but this time I would like to thank Perth Computer Repairs for the provided service. I bought computer from my previous employer and I wanted to do a fresh installation of Windows. I tried to do it myself at first, but could not re-install the windows due to the security an error which said: "There is an error. Cannot connect the Windows Server while booting." Then, quickly looked at the highest rated computer repair service near me. Called them, got the good repair cost. Dropped computer and got it fixed quickly. The owner is very laid back and nice person. Very competitive price and very quality service. Definitely a place to trust. Currently, enjoying my fresh Windows install. Thank you very much!
Greg Reid
Greg Reid
I tell you if you want honest service, no bull call Digby, he's your man.
Virginie Chetty
Virginie Chetty
Digby sourced and setup my new laptop exactly to my needs so that I can remotely access my work computer.
Dianne Casella
Dianne Casella
Digby was efficient, thorough and very helpful in moving me forward with my computer concerns. I am very grateful to have been able to utilise Perth Computer Repairs.
Eric Brain
Eric Brain
Good value repair of my son's pc. Would recommend.
Gwyn annika1@y7mail.com
This man is so patient - me being somewhat of an older generation and not tech savvy - he helped navigate through a printer problem and certainly recommend him to anyone with computer issues!



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0405 119 483