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What The Heck Is An Mup.Sys Error?

by AjeetK

The mup.sys system file has an imporatnt role to play in computer
networks. However, errors in this crucial file can prevent a
computer from booting correctly, or booting at all.

HOW DO I HAVE MUP.SYS ON MY COMPUTER?
Mup.sys finds use only in the more recent operating systems in
the Windows range --Windows XP, Windows NT, Windows 2000, and
Windows Vista. The file has a role to play in a part of the
operating system called a Multiple UNC Provider (MUP). It is part
of a software system that helps networked computers communicate
with one another to share files and peripheral components such as
printers and scanners.

UNC stands for Universal Naming Convention -- this phrase refers
to how a network of computers using the same operating system
make use of one language to describe the locations of resources
used by the network, such as shared files and peripherals.  In
common language, it means that the locations of the resources
stored on a computer are described in only one way.

For example, when looking at the files in your hard drive and
click on a folder, the location of the folder on your hard drive
is listed in an address bar. If you click on a folder or file,
the location of the file could reveal itself as something like
C:foldernamefilename. This structure is used for every file and
folder on a computer, as well as peripheral resources such as
scanners and printers.

Does this show us how the Multiple UNC Provider system works?
When a program on a networked computer tries to access a shared
resource, it makes use of a UNC path (the path refers to the
location of the resource). The access request is forwarded to the
Multiple UNC Provider, which then redirects the request according
to which computer on the network is making it.

The Multiple UNC Provider, therefore, is part of a system that
allows networked computers to communicate with each other in a
particular way.

HOW DOES MUP.SYS CAUSE ERRORS?
Errors in mup.sys are generally the result of file corruption,
or a bug in the Windows operating system that relates to the
mup.sys file. These errors may prevent mup.sys from managing to
load on your PC. The problem with this is that Windows tries to
load mup.sys each time the computer starts up, whether your
computer is part of a network or not.

Therefore, if the file is corrupted to the extent that it cannot
be completely loaded, your computer will either crash or start
rebooting every time it attempts to load the mup.sys file. In
most cases, this happens even when the safe mode option is used.

CAN MUP.SYS CAUSE OTHER ERRORS?
Aside from file corruption errors as described above, mup.sys
may occasionally cause other types of errors, depending on your
operating system and configuration.

An outdated or corrupted mup.sys file could lead to a variety of
non-specific network errors, most commonly in Windows 2000 and
Windows NT. Such errors may include those in Distributed File
System connections between domain controllers and client
computers, as well as more general network errors in networks
running any XP, 2000, NT or Vista version of Windows.

In most cases, the root cause of such errors, including most of
the following, lies in using an operating system version that has
not been updated.

Stop 0x50 Error (Windows NT 4.0)
This error occurs if your sound scheme is set to "No Sounds".
The system is unable to correctly handle this setting -- it
searches for a file called "close.wav" on the network at computer
shutdown, even though sound has been set to off and that file is
not in use. When this happens, a bug in the mup.sys file leads to
error messages. This may happen eaxh time the computer shuts
down.

Stop: 0x0000000a Error (Windows NT 4.0 Terminal Server Edition
Service Pack 6a)
This happens to be a common error. The error is regardless of
system configuration or what applications are currently running.
However, only computers running the above version of Windows NT
tend to be susceptible to this error.

Event ID 2012 (Windows NT 4.0, with Service Pack 3)
An outdated mup.sys file could lead to an Event ID 2012 Network
Error in computers running this version of Windows NT. Such an
error takes place when running an application that uses Btrieve
engine version 6.15 (Btrieve is a database that uses a method of
storing data that provides fast retrieval times).

Non-responsive Network (Windows 2000, SP1 or 2)
An error in mup.sys may occasionally cause computers across a
network to become non-responsive when a networked computer
disconnects from the Distributed File System.

System Error 53 (Windows 2000, Windows NT 4.0)
This error can occur when using a version of either operating
system that may not have got updates. An incompatibility between
mup.sys and the Distributed File System leads to such errors.

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