[THIN] KB: CTX105318 - Slow Response To an ICA Connection When the Data Store Is Offline
- From: "Jim Kenzig Kenzig.com" <jkenzig@xxxxxxxxx>
- To: thin@xxxxxxxxxxxxx
- Date: Fri, 7 Jan 2005 05:09:09 -0800 (PST)
CTX105318 - Slow Response To an ICA Connection When the Data Store Is Offline
This document was published at:
http://support.citrix.com/kb/entry.jspa?externalID=CTX105318
Document ID: CTX105318, Created on: Dec 29, 2004, Updated: Jan 6, 2005
Products: Citrix MetaFrame XP 1.0 for Microsoft Windows 2000
Symptoms
There is a slow response to an ICA connection when the data store is offline.
Cause
If the data store is offline (for voluntary or involuntary reasons), the local
host cache (LHC) will provide continued functionality to the farm for at least
96 hours.
In direct mode with an SQL or Oracle database used to hold the data store, it
can take up to 90 seconds until a MetaFrame server in the farm receives a time
out from the database server and switches to the LHC.
Resolution
This behavior is discussed in the following Microsoft article:
PRB: Client Login Does Not Time Out If the Server Is Offline
http://support.microsoft.com/default.aspx?scid=kb;en-us;176257
A SQL Server client application may not correctly time out according to the set
timeout value in the application if the server it tries to connect to is shut
down or otherwise offline. For example, if the timeout value is set to 10
seconds, the application may not time out until 90 seconds later. This can
happen under either Named Pipes or TCP/IP sockets Net-Libraries, although the
delay may be shorter under TCP/IP sockets.
The solution given by Microsoft consists of modifying (or implementing) the
TcpMaxConnectRetransmissions settings in the registry of the MetaFrame servers.
Caution! This fix requires you to edit the registry. Using Registry Editor
incorrectly can cause serious problems that may require you to reinstall your
operating system. Citrix cannot guarantee that problems resulting from the
incorrect use of Registry Editor can be solved. Use Registry Editor at your own
risk. Be sure to back up the registry before you edit it.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
TcpMaxConnectRetransmissions
Key: Tcpip\Parameters
Value Type: REG_DWORD ? Number
Valid Range: 0 - 0xFFFFFFFF
Default: 3 (in Windows NT)
Default: 2 (in Windows 2000)
Description: This parameter determines the number of times TCP will retransmit
a connect request (SYN) before aborting the attempt. The retransmission timeout
is doubled with each successive retransmission in a given connect attempt. The
initial timeout value is 3 seconds.
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