Rangecast FAQ
[FAQ-1209] Error message: LOST MULTISYNC LEASES (Code 18)


Page Type: SYMPTOM


OVERVIEW

Multisync is a system that coordinates the scanning activity between multiple scanners that operate as a cluster (co-operatively scanning the same channels.) The 'Lost Multisync Leases' error message indicates that this system has broken down (at least temporarily) because of slow operations on either one of the PCs controlling scanners in the co-operating cluster of receivers, or the network connecting these PCs.


SYMPTOMS

Under the 'Lost Multisync Leases' error condition, when a transmission is broadcast over the air, multiple scanners may record the transmission without knowing that other scanners are also recording that channel at the same time. The transmission is then submitted into Rangecast from multiple scanners, resulting in the transmission playing twice (or sometimes even more times) in the Rangecast player, as each copy of this transmission is presented as if it were a separate transmission. This phenomenon is sometimes described by users as "repeating" or "duplicate" transmissions.


METHOD

The condition of 'Lost Multisync Leases' may be transient, and it is recommended that the situation be observed to see if it resolves itself. Rebooting feed site PCs is a reasonable first step, to see if that may clear the issue.

The problem may occur for two different reasons.

a) One of the PCs in the cluster may be operating slowly - for example, some software or process may be running on a PC that consumes 100% of CPU or disk access resources, leaving insufficient processor time for successfully operating the real-time Multisync service. A problem on any one PC in the cluster may affect others operating in the same cluster, since the PCs are necessarily intercommunicating to co-ordinate scanner operations.

A Multisync communications problem relates only to PCs that are operating under a specific feed site number (that is, inter-PC communication is only needed between the PCs controlling scanners co-operatively scanning with each other.) This relates to feed site PCs only - this problem does not relate to any PC where the Rangecast player is being used.

b) The network connecting these PCs may be experiencing high latency or severe bandwidth limitations, interfering with the ability of the PCs to co-ordinate scanning activity. In most cases, the PCs operating scanners for a specific feed site number will be co-located and communicating via a LAN (Local Area Network), so the Multisync communication is not going over the broader Internet. If this applies to your configuration, then the potential network issue to investigate relates to LAN performance.


Rangecast FAQ - ID 1209 - last updated 31 May 2018     Images shown - [block]