| Concluding Modified Appointment | eight/1/2015 xi:53 PM |
| Synopsis | This article explains how load balancing can be configured to route user requests to an PCS either by an external Load Balancer or Round-Robin (RR) Domain Proper noun System (DNS). If an external Load Balancer is used, persistence must be enabled on the Load Balancer for user access to function correctly. This ensures that all the requests from a user are directed to the aforementioned PCS. This persistence can be based on source IP or destination source, depending on the Load Balancer used. RR DNS works by rotating the IP address order of a DNS query response when the DNS name is looked upward. In the case of a non-clustered environs, this can cause the client to send requests to an PCS which does non have whatsoever session information for the user. Although session data is synced betwixt all devices in a amassed setup, the lack of persistence tin can still consequence in unpredictable behavior. Regardless of a clustered\non-clustered setup, the user experience will be range of various client errors, slowness, and session time out messages. |
| Trouble or Goal | The types of problems that can ensue will often vary depend on the environment, but they can range from the post-obit: - The original PCS where the session was initiated will not have an accurate last admission fourth dimension for the user. As a result, it is possible that a user may striking the idle timer and their session will exist timed out although they are actively sending traffic to the PCS. This happens when traffic is sent to an PCS that does non take whatever session data for the user. The last access time is what is used by the PCS to determine if the session is still active or idle.
- User may be unable to admission their applications or may experience occasional slowness when traffic is sent to an PCS other than the PCS where their session was created. This is because an SA will non respond to these requests if it does not accept a session for that user.
- If the client component has not already been downloaded, the following fault could occur:
Error: Failed to verify the downloaded application. Application cannot get-go.  - Secure Meeting (SM)
Error: Y'all cannot access the meeting because your session has expired. Please rejoin the meeting.  - Windows Secure Application Managing director (WSAM)
The Windows Secure Application Manager disconnected. Error Lawmaking: IDD_TIMEOUT  - Network Connect (NC)
The Network Connect session timed out (nc.windows.app.23790)  - Host Checker (HC)
User Access Log might testify several disconnects due to the following: Twelvemonth-Calendar month-Twenty-four hours HR:MIN:SEC - ive - [Source IP] Root::username(Realm)[Role] - Session timed out for username/Realm (session:00000000) due to inactivity (last access at HR:MIN:SEC Year/Month/Mean solar day). Idle session identified during routine system scan. Error "Sorry, your session on this car expired. To re-login, please enter your user information, otherwise for increased security please close your browser."  - Java Secure Application Manager (JSAM)
User may be unable to access their applications or may experience occasional slowness when traffic is sent to an SA other than the SA where their session was created. Error: "Session Expired"  |
| Solution | RR DNS is not a supported method of load balancing your PCS (clustered or non-clustered). If yous require load balancing to evenly distribute the load beyond all your PCSdevices, it is recommended that you implement the utilize of an external load balancer which tin run across the post-obit requirements: - Routes user requests to an PCSbased on source-IP routing (persistence).
- Supports IPSec.
- Listens for traffic on multiple ports. (Ensure all three ports are grouped together and configured to terminate on the same SA in which the session was initiated.)
- TCP/443 - Default HTTPS\SSL port.
- TCP/80 - Default HTTP port (Optional - see KB13903 - Mitigating SSLStrip attack methods on the Pulse Connect Secure).
- UDP/4500 - Default IPSec port used by NC \ Encapsulating Security Payload (ESP) mode and Net Key Substitution version 2 (IKEv2). (Both ESP and IKEv2 are part of the IPSec protocol suite).
- Can be configured to manage traffic using assigned source and destination IP addresses (not destination port).
Note : Delight refer to your specific vendor documentation for how to accomplish these requirements on your load balancer. If y'all are seeing these types of problems and you are using a load balancer with persistence enabled, collect a TCP capture on the concrete adapter of the customer to ensure that the persistence role on your load balancer is still operating properly. |
| Created By | Data Deployment |
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