AD/Exchange/Network issue

I have a strange problem out at a site I'm trying to troubleshoot and it's getting a little confusing where I should be looking.

It started off a few weeks ago where randomly MS Outlook would start disconnecting from the exchange server.  Even when users were connected via cable on-site this was still happening.  I cannot reproduce this fault but I have seen it happen with my own eyes.  this is an on-going issue we are having problems with.

Now I have users not being able to connect to their home drives properly.  In the attached image we have shares/home drives setup so users can go to \\company and see their shares.  Now randomly this isn't working for some users, only two so far, and they are getting the error in the image.  I managed to get this error after trying to rename a file in that folder, as you can see you can see the folder but when trying to manipulate inside the folder it there are issues.  Now the weird thing is i can use the server name \\company-server1\sales\wendy and everything works fine.  I hope this is making sense.

Should I be looking for issues on my domain controller, exchanges server, file server or all of the above?  Also I have checked and DNS seems to be working fine.  Do i have multiple problems here or maybe one problem (AD for example) causing these issues?
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LogicalSolutionsNZAsked:
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LogicalSolutionsNZConnect With a Mentor Author Commented:
So we managed to fix the issue.  The problem was with a secondary domain controller not syncing properly.  AD and DNS was affected.  Rebooting the second DC did the trick.

Thanks
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XaelianCommented:
You should look for errors for all of the above. Did you open the eventviewer? Can you post the errors you get here?
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Sarang TinguriaSr EngineerCommented:
I would recommend to check for any network issue... if any of network device generating unwanted traffic or boadcasting
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LogicalSolutionsNZAuthor Commented:
So further testing has shown..................

Trying to execute \\company from the file server prompts with pass authentication which is strange since we are using a domain admin account.  But If I go to \\fileserver (which by the way \\company is only a DNS pointer to the same address) the shares come up fine.

We rebooted the domain controller and on the domain controller when trying to go to \\company got a different error message as seen in the attached image.

By the way \\company is only a DNS pointer we use which points to \\fileserver.

We have tested extensively and cannot fault DNS.  We have restarted the service, created a new pointer and still the issue is there.  Interestingly enough when we deleted the \\company pointer on the domain controller (primary DNS server) we could still ping \\company even after flushing DNS multiple times.  We created a new DNS A record, \\company2 , and that works perfectly fine.

There have been no changes on the network which we know about and errors logs do not show very much apart from one policy error on the DC which we think is unrelated.
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Sarang TinguriaSr EngineerCommented:
try continous ping Fileserver -t and check for any drops
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LogicalSolutionsNZAuthor Commented:
Continuous ping from domain controller to 'companyname' and 'fileserver' are rock solid at <1ms with no drops.
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kronovideCommented:
possible IP conflict.
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Sarang TinguriaSr EngineerCommented:
Please check with your local Network admin if you have L3 switches he would require a minute to Justify nework
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S_K_SCommented:
The way you mention all looks good however there definitely is some network issue. Try running tracert command from source to destination.
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LogicalSolutionsNZAuthor Commented:
Network looks fine.  Tracert just goes straight to server as there are no hops in between these server, they are all on the same layer2 LAN.
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S_K_SCommented:
You mentioned this issue pop-ed up for only few users yet....that too intermittently. Did you get a chance to check if other users too faced the problem when these 2 users faced the problem. Trying to understand if this is a global issue or user specific. What if we want to add the host entry on the problem machines. Have we tried using these users log in onto any other machine at the time of issue?
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LogicalSolutionsNZAuthor Commented:
The weird thing is for these users that name actually resolves, the shares come up, but then are unusable.

Even I as an administrator on the server are getting the same issue, but only on certain servers, not all of them.  And i don't see a pattern emerging on which ones work and which ones won't.

I will check now if htese users can log into other machines and get the same issue
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S_K_SCommented:
Wierd problems need to have wierd and crazy solutions :)

I wanna try the host file entry thing
One more thing that I wanna try is removing the permissions over that share and adding them again and then check how things look.

Regards
SKS
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LogicalSolutionsNZAuthor Commented:
So have just confirmed one of these users can log on to a different computer and access \\company with no issues.

i have her machine book in for me to take over in about 45mins and I'm going to try modifying the hosts file etc.....

Any other suggestions????
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S_K_SCommented:
Well Recreating the user profile on his machine is what we can try but not sure if that would work for sure...
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S_K_SCommented:
Another thing is....are sure there is no issue with the new machine? Asking since this is an intermittent issue...
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LogicalSolutionsNZAuthor Commented:
Well this is happening not onyl on this users machine but another user also, using a different machine.  And the actual error messages I've posted have come from me being logged in as a domain admin remoting in to virtual servers.

I don't think this is a localized issue with a problem PC.
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S_K_SCommented:
well as off now..
I wanna try the host file entry thing
One more thing that I wanna try is removing the permissions over that share and adding them again and then check how things look.
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piyushranusriSystem Cloud SpecialistCommented:
file directly is on server hdd or LUN is attached to the server ?
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LogicalSolutionsNZAuthor Commented:
Because no one else had the right answer
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