DAG Add Database Copy Error: RPC unavailable 0x800706BA

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Issue: when adding a new database copy to an Exchange 2013 DAG you receive the following error: error WMI exception occurred on server 'EXCH02.enterpriseit.co': The RPC server is unavailable. (Exception from HRESULT: 0x800706BA) Cause: As stated this error is caused by RPC communication issues between the Exchange DAG members.  Likely ports in the 6001-6032 range are being blocked. Resolution: You will need to proceed to troubleshooting RPC unavailable 0x800706BA on Windows Server.  The Read more [...]

Troubleshooting ‘RPC server unavailable’ 0x800706BA

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Issue: You are getting the error: "The RPC Server is unavailable. (Exception from HRESULT: 0x800706BA)" Cause: This error is likely caused by the RPC ports being blocked between the servers involved in the communication or server process you are trying to complete. Background: RPC is categorized as the X11 protocol and is in the 6001 to 6032 port range.  Commonly 6007 is what is being blocked in this case. Diagnosis: You can test RPC connectivity from the server you are on to another Read more [...]

Exchange 2013 Datacenter Activation Coordination (DAC) Mode

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Datacenter Activation Coordination (DAC) Mode is a property of an Exchange DAG that is used to prevent 'split-brain' syndrome where multiple members activate their databases without knowing whether or not the other members have their databases mounted. What happens when DAC mode is enabled and set to 'dag only': After a failure of Exchange, Exchange will use the DACP protocol to determine the current state of a DAG and whether the databases should be mounted on a server.  DAC mode requires Read more [...]

How to install Exchange 2013 CU21 step-by-step

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Issue: You need to deploy Exchange 2013 CU21. Solution: The following step by step instructions will guide you through the Exchange 2013 installation process.  This will be a new installation of Exchange 2013 using the CU21 media. 0) If you haven't already done so, you first need to install the Exchange 2013 pre-requisites and prepare the AD Schema for Exchange 2013 CU21. 1) Download Exchange CU21, here is a convenience link to download the latest version of Exchange 2013. 2) Execute the downloaded Read more [...]

NetScaler 10.1 not supported on Hyper-V 2012 R2

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As of 6-6-14, Citrix Netscaler 10.1 is not supported on Hyper-V 2012 R2. Hyper-V 2012 R2 will be supported in the next revision of Netscaler (version 10.5) hopefully due out end of Q2. NetScaler 10.5 was available for demo at Citrix Synergy so I anticipate it will be released shortly.

Citrix will support getting Netscaler 10.1 imported on Hyper-V 2012 (R1), however work arounds are needed to account for the changes made by Microsoft between 2008 R2 and 2012.