uniFLOW Online experienced delays in accepting connections from devices and SmartClients. This impacted login, printing and general tenant performance. Feedback from support and internal tested confirmed the SmartClient was grayed out and hovering over would state the client is offline.
Scope of Impact
EU and UK, Deployment
Incident Start Date and Time
September 26 07:00 UTC
Incident End Date and Time
September 26 07:50 UTC (Primary Incident).
Following a detailed investigation, the root cause has been identified and we have placed mitigation controls in place. The overall cause was resource exhaustion on single or multiple components which either accepted requests from endpoint or processed the requested actions. Addressing these resource issues is a standard operational process and in itself would address each incident.
Under certain conditions this load was amplified and due to older (pre 2023.1) SmartClients in the field that would initiate multiple requests to reestablish the lost connection and by this action contribute to the artificial loading of the system. This behavior was changed in recent SmartClient including general performance improvements. The difference in operation can be seen on other deployments what have a higher percentage of newer clients.
During the investigation we have also confirmed that the root cause was a contributing factor to previous incidents listed on the dates below.
Each of the listed incidents were unique and their impact on performance and usability. The visible impact to the end user was always the same or similar, being performance / connectivity issues.
Development implemented cloud side code improvements over the weekend 30th September - 1st of October to handle the SmartClient requests. This does not negate the need to update the SmartClients in the field but suppresses where possible the additional communication and connections.
QA testing and Evaluation over the weekend saw an immediate improvement in the service condition and health.
SmartClient as with any software, should be at the latest versions to benefit from performance and security improvements. It is recommended to customers that have not updated the SmartClient prior to 2023.1 that they look to perform this update.
We apologize for the impact on affected customers. We are continuously taking steps to improve the uniFLOW Online Platform and our processes to help ensure such incidents do not occur in the future. In this case, this includes (but is not limited to):
Implementing an EOL plan for older SmartClients to improve overall performance.
With 2023.4 the visibility of installed new SmartClients will be visible.
Planning is working on specifications to implement an auto update mechanism for SmartClient configurable by the tenant admin.