Category Archives: Uncategorized

Files can’t be opened error in windows

Below the document shows  how to reset IE security settings while getting these error.



How to configure cluster quorum using as a share Windows 2008-12

Here is a document described,how to configure a cluster which quorum from a file share from a third server.

Windows 2008-12 cluster quorum using as file share

Difference between Online(hot)and Offline(cold) backup

Offline backup(cold backup)is a database backup performed when the database is disconnected from the network(not accessible while updating,because it avoids the risk of copying data that may be in the process of being updated). It required downtime.

Online backup(hot backup or dynamic) is a method of offsite data storage in which files, folders, or the entire contents of a hard drive are regularly backed up on a remote server or computer with a network connection.

computers are connected to the Internet, automatically copying selected files to backup storage sometimes called Web-based backup.

Rollback installed patches

After installation, how to Roll back patches in windows

How to Rollback installed patches

Default Symantec Endpoint Protection 12.1 RU1 Firewall Rules explanation

What’s new in SEP 12.1?

Ø  New Default FW rules (Allow Web Service, LLMNR, SSDP on private networks)

Ø  FW rule for TCP/UDP is now effective for both ipv4 and ipv6 traffic. All FW rule columns are applied for both ipv4 and ipv6 traffic. Ex: port, application, action, time, etc.

Ø  Limited IPv6 support. i.e.

–           The FW rule does not allow user to specify ipv6 address.

–           Use ‘All hosts’ for the ‘Hosts’ column

–           This means all ipv4 and ipv6 addresses

–           Traffic, Packet, Security Logs can display ipv4/ipv6 addresses.

–           No support yet for IPv6 tunneling (ISATAP, Teredo, etc).

Ø  Ability to disable FW policy on Client UI

Ø  Option to disable Windows Firewall

Ø  Decoupling FW and IPS component

Ø  FW rule support “Local Subnet”

Default Symantec Endpoint Protection 12.1 RU1 Firewall Rules explanation

Default Symantec policy explain


Build cheap NAS storage for SMB-Part4 Access windows share

How to configure a windows share and how to access it

Sharing a volume to access to windows-part4

Build cheap NAS storage for SMB-Part3 Configurations

Configuration documented here

Free BSD NSA Configurations-part3

Build cheap NAS storage for SMB-Part2 Basic features

Here is the document

Free BSD NSA basic features-part2

Build cheap NAS storage for SMB-part1 installations

Here is the installation document

Free BSD NSA Installations-part1

Build cheap NAS storage for SMB-Opensource based FreeNAS

Definition from wikipedia page
Network-attached storage (NAS) is file-level computer data storage connected to a computer network providing data access to a heterogeneous group of clients. NAS not only operates as a file server, but is specialized for this task either by its hardware, software, or configuration of those elements. NAS is often manufactured as a computer appliance – a specialized computer built from the ground up for storing and serving files – rather than simply a general purpose computer being used for the role.

NAS devices are gaining popularity, as a convenient method of sharing files among multiple computers.[1] Potential benefits of network-attached storage, compared to file servers, include faster data access, easier administration, and simple configuration.

NAS systems are networked appliances which contain one or more hard drives, often arranged into logical, redundant storage containers or RAID. Network-attached storage removes the responsibility of file serving from other servers on the network. They typically provide access to files using network file sharing protocols such as NFS, SMB/CIFS, or AFP.

NAS is useful for more than just general centralized storage provided to client computers in environments with large amounts of data. NAS can enable simpler and lower cost systems such as load-balancing and fault-tolerant email and web server systems by providing storage services. The potential emerging market for NAS is the consumer market where there is a large amount of multi-media data. Such consumer market appliances are now commonly available. Unlike their rackmounted counterparts, they are generally packaged in smaller form factors. The price of NAS appliances has plummeted in recent years, offering flexible network-based storage to the home consumer market for little more than the cost of a regular USB or FireWire external hard disk. Many of these home consumer devices are built around ARM, PowerPC or MIPS processors running an embedded Linux operating system.

List of network protocols used to serve NAS

Read my other posts for building and using


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