Enterprise Vault (EV) Vault Cache Synchronization fails with exception "Unknown host located in site", for all users when the EV server is running with a Turkish language setting

Problem

EV Vault Cache Synchronization fails for all users when the EV server is running with a Turkish language setting. Additionally for this issue to occur the EV servers alias name must contain the capital letter I.

Error Message

• DTRACE against the w3wp process reveals the following:

(w3wp) <7340> EV-H {PROXY.EN_US} GetRedirectedURL - Redirecting to EV Server
URL http://IVAULT/EnterpriseVault/GetVaultInformation.aspx?x=evoutlookext
(w3wp) <7340> EV-L {PROXY.EN_US} Checking withApplication cache whether host is local or not
(w3wp) <7340> EV-H {APPLICATIONCACHE.EN_US}Unable to locate node ivault in site.
(w3wp) <7340> EV-H {COMMON.EN_US}Exception: Unknown host located in site Info:VEID:UNKNOWN Diag:
Type:System.Exception ST:   at
DesktopClientCacheWeb.ApplicationCache.IsHostRemote(Uri uri)|   at
DesktopClientCacheWeb.Proxy.IsEvHostRemote(Uri uri, String host)|   at
DesktopClientCacheWeb.Proxy.DoRemoteRequest(HttpRequest Request, HttpResponse Response, String[] reqHeaders, Boolean& writtenHeaders)|   at
DesktopClientCacheWeb.GetVaultInformation.Page_Load(Object sender, EventArgs args) Inner:None

• IIS log shows:

• EV client trace shows:

Cause

This issue has only been seen with the EV server configured with a Turkish language and the EV server alias containing a capital letter I ONLY.

The issue is caused due to the Vault Cache sync process comparing two strings with the ToLower function. This function converts an uppercase I to a different character than a lowercase 'i', thus rendering our comparison invalid and causing the problem.
 

Workaround

Change the EV server that contains the capital letter I to a lowercase i. For example, change IVAULT to iVAULT.

1. Ensure that you have a working backup of the EnterpriseVaultDirectory database.
    
2. Stop all EV services
    
3. Run the following SQL command to perform the name change. Replace NameOfEVserveraliasinlowercase and NameOfEVserveraliasinUPPERcase with the correct values:
   
   USE EnterpriseVaultDirectory
   SET ComputerName = 'NameOfEVserveraliasinlowercase'
   WHERE ComputerName = 'NameOfEVserveraliasinUPPERcase'
    
4. Start all EV services.
    
5. Run a manual mailbox synchronization run across all mailboxes. This step will push the EV server alias name changes to each users hidden message.
    
6. EV enabled users Vault Cache Synchronization's should now be successful.

Solution

Applies To

All EV versions that support Vault Cache.

EV server must be running a Turkish region and language format.

EV server must have a capital letter I in the EV server alias.