How to Allow SSL Offloading
According to Window Security, Secure Socket Layer (SSL) refers to a method used to encrypt data transferred over the Internet. It is used to provide safe transmission of credit card and other sensitive information over the Internet. The method utilizes symmetric encryption to provide confidential information with the strength of the encryptions being promoted by use of longer keys such as DES, 3DES, RCR and RC4. These keys may vary in lengths of up to 168 bits. SSL offloading involves transferring of SSL processing from a CPU server to a card processor. This takes off SSL processing load from a web server.
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Instructions
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Activate a live Internet connection and open Microsoft Outlook browser. Log on to the exchange server housing SSL-enabled user connections. Select an appropriate server configuration by choosing either a front-end or a back-end topology.
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Using the "Run" option from the start menu, open the registry editor by keying in the parameters "regedit.exe".
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Access OWA settings from the Microsoft exchange web by following the parameters; HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB\OWA
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Set a new DWORD Value by right-clicking the OWA sub-key and choosing a new DWORD Value option. Assign the new value a name such as 'SSL offloaded' with a numerical value of one (1).
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Exit the registry editor after modifying the settings.
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Register the ISAPI filter by contacting Microsoft Product Support. Obtain a copy of ExFeHttpsOnFilter.dll.
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Log in to the exchange server hosting SSL-enabled user connections after obtaining a copy of ExFeHttpsOnFilter.dll. Select an appropriate server topology. You can choose either a front-end or back end server topology.
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Make a copy of the DLL file to the "exchsrvr\bin" directory on the destination exchange server and launch the IIS Manager snap-in. After launching the IIS manager snap-in, expand local computer and web sites nodes.
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Choose the properties option from the "Default Web Site" entry by right-clicking on it to select. From the properties option, switch to ISAPI Filters tab. Click on the "Add" button.
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Type "ExFeHTTPSOn" in the Filter Name field. Specify the DLL file location in the "Executable" field and click "OK". Review to ensure that the added filter is placed before the "ExchFilt" filter using the "move up" and "move down" buttons.
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Start over the IISAdmin and W3SVC services.
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