Laptop keeps dropping network drive.

I have a laptop on a network.   Almost everyday the laptop needs to be reconnected with the users network drive folder on the server (running Server 2012).  he next day they bootup their laptop and the network drive is missing again.   Over 95% of the time, network drive has to be connected by the server IP address\users\xxxxxxxxx because even though it sees the server on the network, it is not allowed to connect via the server name.   I look at the users permissions on the server and their folder and they are there on each.   Any idea what is happening to cause this?
syssolutAsked:
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JohnBusiness Consultant (Owner)Commented:
It would appear the machine is being confused by Persistent drives.

Remove all drives with NET USE T: /Delete for all drives.

Set your script process to:

NET USE X: /Delete
NET USE X: \\server\folder

Run TCP/IP Reset and DNS Flush and after restart, test.

Open cmd.exe with Run as Administrator
Then  netsh int ip reset c:\resetlog.txt
Also, ipconfig /flushdns followed by net stop dnscache followed by net start dnscache
Then restart the computer
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syssolutAuthor Commented:
I am not sure I am doing the Net use correctly.  I am getting Error 67 the network name cannot be found.   And error 2221 the user name cannot be found.
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JohnBusiness Consultant (Owner)Commented:
System Error 67 is caused by improper network configuration or network drivers needing updates.  See this Microsoft Support article for further explanation.

https://support.microsoft.com/en-us/kb/843156
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giltjrCommented:
I would double check your DNS configuration and the configuration of the NIC.   If you can map by IP address, but not by name and you are getting Error 67, that implies a possible issue doing computer\host name lookup in addition to the possible problems John Hurst has pointed out.

Does this laptop have wired and wireless network adapters?  Does this user take the laptop home and use it there?
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syssolutAuthor Commented:
NET USE X: /Delete
NET USE X: \\server\folder

Run TCP/IP Reset and DNS Flush and after restart, test.

Open cmd.exe with Run as Administrator
Then  netsh int ip reset c:\resetlog.txt
Also, ipconfig /flushdns followed by net stop dnscache followed by net start dnscache
Then restart the computer


John  I tried this, but not sure it I did them correctly.   It worked for a few days, then it stopped working.

Giltjr, it is wireless on a domain.   This is the only computer doing this.  I believe the user takes it home occasionally.
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giltjrCommented:
Doing some searching on the 2221 error most of the solutions seem to indicate that incorrect copy of credentials have been cached by the credential manager.

Search for "Credential Manager" and open it.  Look to see if there are any cached credentials and remove them.
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JohnBusiness Consultant (Owner)Commented:
Look at the laptop when it comes back and do a TCP/IP Reset , DNS Flush and ask the user to NOT take it home for several days (provide a different laptop if you can). Does the connection drop when only used in the office?  

It goes home: Check for viruses and malware.
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syssolutAuthor Commented:
I just found out something interesting.   I signed in under Network administrator and the network drive was working using DNS.   I logged in under the user and it was disconnected and the user cannot connect to the server using DNS.   They have to be mapped using IP address of server.
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JohnBusiness Consultant (Owner)Commented:
They should have been mapping properly as above. Does the folder now stay connected?
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giltjrCommented:
I would save the output from "ipconfig /all" when logged on as admin and as the user and see if there is a difference.
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syssolutAuthor Commented:
No the folder does not always stay connected John.

giltjr, I will look at the match up of the ipconfigs
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JohnBusiness Consultant (Owner)Commented:
Did you try updating the network drivers?  Also there have been several Patch Tuesdays since you posted. Have you update the machine and the servers?
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syssolutAuthor Commented:
I ran this again and it seems to have stopped dropping the shared drive   Sorry for the delay, was just making sure it wasn't dropping.   Thanks
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JohnBusiness Consultant (Owner)Commented:
@syssolut - Thanks for following up.
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