SUMMARY:

This article explains how to deactivate the kernel mode filter driver without removing the corresponding software. You may desire to deactivate the filter driver when you are troubleshooting the following problem:

File copy or else backup problems.

Whenever you are opening files from network drives or else you are saving files to network drives, Program errors occur.

Event ID 2022 errors messages that happen in the System log, e.g.
Event ID: 2022
Source: SRV
Type: Error
Description: The server was unable to find a free connection number times in the last number seconds.

MORE INFORMATION:

When you are troubleshooting any one of these problems, often, you contain to do more than just stop or disable the services that are linked with the software. Even if you stop the software component, the filter driver is still loaded when you reboot the PC. You may be forced to remove a software component to find the reason of a problem. As an alternative to removing the software component, you can stop the relevant services and disable the corresponding filter drivers in the registry. E.g. you must also stop the corresponding filter drivers, if you avoid antivirus software from scanning or filtering files on your PC.

You must first discovery third-party services and their corresponding filter drivers, to stop filter drivers. After you perform this, follow these steps.

1. Stop all services that belong to the software package.

2. Set the Startup type to "Disabled." To do this, follow these steps:

a. Click on the Start button>>click on the Control Panel>>double-click on the Administrative Tools>> as well as double-click onServices.

b. In the Details pane, right-click on the service that you wish to configure>> and after that click on Properties.

c. On the General tab>>click on the Disabled in the Startup type box.

3. Set the Start registry key of the equivalent filter drivers to 0x4. A value of 0x4 will stop the filter driver. To execute this, pursue these instructions.

a. Start Registry Editor.

b. Make a backup of the HKEY_LOCAL_MACHINE\System registry hive.

c. set, and afterward click the subsequent registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es

d. Click the entry for the filter driver that you want to stop.

e. Double-click the Start registry setting, and then set it to a value of 0x4.

4. Reboot the PC.

Most antivirus software utilizes filter drivers that work mutually with a service to scan for viruses. These filter drivers are still loaded once the service is disable. These filter drivers scan files as they are opened and closed on a hard disk.

Backup agent

• Backup Agent for Open Files: Ofant.sys
• Open Transaction Manager from Veritas BackupExec: Otman.sys (Otman4.sys or Otman5.sys)


The "stop 0x7b Inaccessible_Boot_Device" error message may happen if the following registry keys exist and have references to the Otman5 driver when the Otman5.sys driver either does not be present on the hard disk or if the driver is set to disabled.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E967-E325 -11CE-BFC1-08002BE10318}\UpperFilters

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{71A27CDD-812A -11D0-BEC7-08002BE2092F}\UpperFilters

Driver registry settings

The following table record suitable settings and their detail for the driver's Start and Type registry settings:

Value Name Value Setting Description of Value Setting
Start 0 = SERVICE_BOOT_START Ntldr or Os loader preloads the driver so that it is in memory when the computer starts.
These drivers are initialized just before the SERVICE_SYSTEM_START drivers.
Start 1 = SERVICE_SYSTEM_START The driver loads and initializes after SERVICE_BOOT_START drivers have initialized.
Start 2 = SERVICE_AUTO_START Service Control Manager (SCM) starts the driver or service.
Start 3 = SERVICE_DEMAND_START SCM must start the driver or service on demand.
Start 4 = SERVICE_DISABLED The driver or service does not load or initialize.
Type 1 = SERVICE_KERNEL_DRIVER Device driver.
Type 2 = SERVICE_FILE_SYSTEM_DRIVER Kernel-mode file system driver.
Type 8 = SERVICE_RECOGNIZER_DRIVER File system recognizer driver.