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NetScaler Application Delivery Software 5.2: Load Balancing

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Technotes	Created	Modified	Read	Rating
HTTP-ECV Monitor Probes Are Failing Summary This document describes how to troubleshoot monitor of type HTTP-ECV. In this case, HTTP-ECV monitor probes sent by the NetScaler to the server are failing, even though the web page c... CTX110167	8/30/06	10/15/08	5,583
Description of the Redirect URL Feature Summary This document describes the redirect URL option that may be applied to virtual servers (vservers) on the NetScaler. Background A virtual server of type HTTP or HTTPS may be configured... CTX108946	4/7/06	10/13/08	9,954
Access to the Web Servers is not Available through the NetScaler Appliance Symptoms You are not able to access the Web servers through the NetScaler appliance virtual servers (vservers) even though the vservers and services are running in the UP state. The vservers ... CTX116878	4/17/08	8/8/08	779	Unrated
Case Study - Bookmarks on the NetScaler Appliance do not Work Problem Definition A customer wanted to design a network topology that has two pairs of NetScaler appliances. The frontend NetScaler appliance pair has VPN configured on it and has a few book... CTX117285	8/7/08	8/7/08	293	Unrated
The DNS Server Fails to Resolve Domain Requests Symptoms If the Domain Name System (DNS) server is not available, users cannot resolve domain requests. However, if you restart the switch and the DNS server, the issue is resolved. Cause Inv... CTX116877	5/12/08	5/12/08	582	Unrated
How to Change the Mapped IP, NetScaler IP, and Routes Without Affecting the Production Traffic on a NetScaler High Availability Pair summary This article describes how to change the Mapped IP (MIP), NetScaler IP (NSIP), and routes without affecting the production traffic on a NetScaler High Availability (HA) Pair. Because ... CTX116835	5/9/08	5/9/08	1,005	Unrated
Configuring SSL with Backend Encryption on the NetScaler Appliance Causes Delay in Response Symptoms In addition to the SSL offloading, when the NetScaler appliance encrypts the backend traffic to the server, the “Page cannot be displayed” message is displayed intermittently if the ... CTX116874	5/9/08	5/9/08	647	Unrated
Virtual ID Conflict is Observed on the NetScaler High Availability Pair Symptoms The console of the NetScaler appliance High Availability Pair displays an error message stating a conflict for the virtual ID (VRID). Cause You might have connected both the NetScale... CTX116876	5/9/08	5/9/08	531	Unrated
How to Retrieve the Current Configuration after Upgrading the NetScaler Software on a High Availability Pair Summary This article describes how to retrieve the current configuration after upgrading the NetScaler Software on a High Availability Pair. When you make any changes to the configuration of ... CTX116837	5/9/08	5/9/08	555
How to Enable TCP Traffic on a High Availability Pair after Upgrading it to the Latest Release of NetScaler Software Summary This article describes how to enable TCP traffic on a High Availability pair after upgrading it to the latest release of NetScaler software. Consider the following scenario: A high av... CTX116836	5/9/08	5/9/08	506	Unrated
The CPU Usage Reaches 100% and the Connections are Terminated on a NetScaler High Availability Pair Symptom When you perform SSL offloading on NetScaler software release 6.1 on a high availability pair of NS9950 NetScaler appliances, the CPU usage reaches 100% and all the connections are te... CTX116875	5/8/08	5/8/08	547	Unrated
If Multiple Monitors are Bound to a Service, do All of the Monitors Have to Fail for the Service to be Disabled? Q: If multiple monitors are bound to a service, do all of the monitors have to fail for the service to be disabled? A: No. It only takes one monitor to fail for a service to be disabled. In NetS... CTX109851	7/3/06	11/21/06	5,100	Unrated
How User Datagram Protocol Load Balancing Works Summary This article describes how User Datagram Protocol (UDP) load balancing works. Background Unlike TCP (which is a connection-oriented, reliable protocol), UDP is connectionless and unreliabl... CTX110551	10/9/06	10/10/06	5,356	Unrated
Firewall Sandwiches with NetScaler Summary This article describes simultaneous load balancing of ingress and egress network traffic through firewalls (also known as a firewall sandwich ). Background A NetScaler deployment in a spe... CTX110550	10/9/06	10/9/06	5,450	Unrated
What Causes a NetScaler to Load Balance Traffic Unevenly when Configured with SOURCEIP-based Persistence? Q: What causes a NetScaler to load balance traffic unevenly when configured with SOURCEIP-based persistence? A: Uneven load balancing may occur for two basic reasons: 1. The configured load balanc... CTX109895	7/26/06	7/26/06	1,118	Unrated
How do You Extract the Client IP Header for Logging on the Web Server? Q: How do you extract the client IP header for logging on the web server? A: Under Apache 2.x, you can edit the CustomLog format to include %{Client-IP}i to replace the %a (remote IP) or %h (remot... CTX109730	7/26/06	7/26/06	5,861	Unrated
How do you Transfer an SSL Certificate and Key from Netscape 3.6/iPlanet 4.1 to a NetScaler ? Q: How do you transfer an SSL certificate and key from Netscape 3.6/iPlanet 4.1 to a NetScaler ? A: Keys and certificates are stored on the server in a database format. They are stor... CTX109875	7/14/06	7/17/06	11,202
What Types of Persistence does the NetScaler System Support? Q: What types of persistence does the NetScaler system support? A: Cookie insert persistence : When this persistence type is used, the NetScaler inserts information about where or which serve... CTX109878	7/13/06	7/13/06	6,032
Why Do You Get an "Operation not permitted" Error Message When You Try to Set the Load Balancing Method to leastRESPONSETIME for a TCP-based "lb vserver"? Q: Why do you get an “Operation not permitted” error message when you try to set the Load Balancing method to leastRESPONSETIME for a TCP-based “lb vserver”? A: For the leastRESPONSETIME metho... CTX109877	7/11/06	7/11/06	4,332	Unrated
Does the NetScaler System Provide a Slow Start if a Service is Re-enabled After a Previous Service Disabling? Q: Does the NetScaler system provide a slow start if a service is re-enabled after a previous service disabling? A: It does if the Load Balancing method is one of the following: Least Conn... CTX109871	7/10/06	7/10/06	4,435	Unrated
How Does the Global Setting for Use Source IP Address (USIP) Interact with the Individual Service USIP Settings? Q: How does the global setting for Use Source IP address (USIP) interact with the individual service USIP settings? A: When USIP mode is enabled globally, two things happen: All automaticall... CTX109858	7/3/06	7/3/06	6,310	Unrated
When Purchasing Certificates for the NetScaler from the SSL Certificate Vendor Web Site, What Web Server Type Should You Specify? Q: When purchasing certificates for the NetScaler from the SSL certificate vendor Web site, what Web server type should you specify? A: When requesting a certificate from a vendor that will be ... CTX109854	7/3/06	7/3/06	5,654	Unrated
Why does NetScaler Need FRONT_END_HTTPS for Microsoft Outlook Web Access/Exchange Server? Q. Why does NetScaler require FRONT_END_HTTPS for Microsoft Outlook Web Access/Exchange Server? A: Microsoft Exchange Server installs two components – a front-end and back-end server – for Outloo... CTX109881	6/12/06	6/28/06	6,160	Unrated
Is TCP Fast Ramp RFC compliant? Q: Is TCP Fast Ramp RFC compliant? A: No. Version 6.x of the NetScaler system has this feature disabled by default. It can be re-enabled as needed. CTX109745	6/22/06	6/23/06	4,565
What is a Mapped IP Address? Q: What is a Mapped IP address (MIP)? A: A MIP is a Mapped Internet Protocol address in the NetScaler system. Request switching intercepts an incoming client’s IP and replaces it with a ... CTX109747	6/22/06	6/22/06	10,459
Can a Default Monitor be Unbound From a Service? Q: Can a default monitor be unbound from a service? A: No. Default monitors cannot be manually bound/unbound/deleted/changed, they can however be disabled by virtue of adding a non-default monitor... CTX109733	6/19/06	6/19/06	4,801	Unrated
How Do You Extract the Client IP Header for CGI Scripts From a Web Server? Q: How do you extract the client IP header for CGI scripts from a Web server? A: Under Apache 1.3.x, use the package at [url http://web.warhound.org/mod_extract_forwarded/]mod_extract_forwarde... CTX109729	6/19/06	6/19/06	4,476	Unrated
How do You Use OpenSSL to Test Whether an SSL Server is Working Q: How do you use OpenSSL to test whether an SSL server is working? A: Use the following command: root@ns#openssl s_client -connect destip:destport -debug -state If that works, you'll be left at ... CTX109723	6/16/06	6/16/06	6,799
How To Configure Transparent SSL Summary This article describes how to configure Transparent SSL. Procedure To configure Transparent SSL, create a wild card IP address-based vserver as shown below: > add vserver va1 SSL * 443 ... CTX109721	6/16/06	6/16/06	8,651	Unrated
Can the NetScaler redirect on SSL version 2.0 as well as cipher strength? Q: Can the NetScaler redirect on SSL version 2.0 as well as cipher strength? A: NetScaler supports redirect only for ciphers. CTX109708	6/15/06	6/15/06	4,680	Unrated

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