DNS causing workstation crashes / lock outs? [SLG]

[Heliosedu]

Hi,

 

We have an issue where users making a change in SIMS (has occurred in assessment, lesson monitor, behaviour), take a long time to save and then get an error and closes SIMS. Often, users then can’t get back in to SIMS. Sometimes it gives them the reason 0 error (even though their .ini contains a timeout of 10000), but some times absolutely nothing happens when running SIMS (no log in screen is presented either).

 

Strangely, this error logging in does not occur on all workstations. We've also had instances where a user on a workstation can't get in at one point of the day, but can several hours later with no changes made. Some users can't get in on one workstation but can on another.

 

In the DNS under interfaces we have Ipv6, the IP for the admin server and the SLG adapter. We have found if IPV6 and the SLG adapter are unticked the issue seems to stop. However, we're not sure why this would be the case and we don't really want to keep them unticked in future.

 

To give you more of a timeline / summary of the events :

 

Everything was working on Monday. From Tuesday :

 

• Workstations crashing
  
• Network running slow
  
• Happening several applications (This isn't just SIMS specific)
  
• Everything seemed to work fine once all the users had gone home (reduced network load?)
  
• Problem occurring on both wired and wireless workstations
  
• Workstations stopping and starting to work with no changes made
  

 

 

 

Does anyone have any insight in to what could be causing this? Have logged a job on Capita but not having any luck with them so far.

Edited September 10, 2015 by Heliosedu

[Heliosedu]

Edited the original post with additional information. Thanks!

[Banjo]

Can you ping the server from the affected workstations when they can't connect?

 

Do you use the server name or the IP address in the connect.ini file as it might be worth switching these around to test ?

 

Bad switch or a bad port maybe, has part of the network dropped from a gig down to 100mb?

Edited September 11, 2015 by Banjo