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Hi, Server 2008 running netbackup. Exchange 2010 environment. Have used this same policy for writing to tape the DAG01 files for a few months at minimum. Have not had issues. <br />
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&nbsp;Now I attempt to run the netbackup policy DAG01 and it fails, saying error 26, client handshake error.. &nbsp;if I attempt to PING DAG01 &nbsp;I get a failure although it shows the correct IP.. I cannot ping the IP, I can however nslookup correctly. <br />
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&nbsp;any ideas would be appreciated. TY
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Hi, Server 2008 running netbackup. Exchange 2010 environment. Have used this same policy for writing to tape the DAG01 files for a few months at minimum. Have not had issues. 

 Now I attempt to run the netbackup policy DAG01 and it fails, saying error 26, client handshake error..  if I attempt to PING DAG01  I get a failure although it shows the correct IP.. I cannot ping the IP, I can however nslookup correctly. 

 any ideas would be appreciated. TY

Netbackup DAG Client Handshake Issues

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.

Storage Hardware

The term "Backup" means the methods and processes involved to copy computer data (system data as well as application data) to media other than the ones where the data originally live (disk, tape, optical, cloud). "Restore" in turn means the methods and processes involved in data recovery, i. e., bringing back copied computer data to their original location. Backup/Restore primarily serves as a means of protection against data loss, be it due to disaster, corruption or sabotage. It can also be used for recovering data from an earlier point in time and even for cloning machines or applications. There is a wide variety of backup/restore software available, from expensive commercial products to free or open source tools.

Storage Software

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.

Windows Networking

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.