Incident: Sky Broadband Outage Impacts UK Banking Apps and Websites

Published Date: 2021-08-20

Postmortem Analysis
Timeline 1. The software failure incident happened on the morning of 2021-08-20 as reported in Article 117521.
System 1. Sky Broadband [117521]
Responsible Organization 1. Sky Broadband [117521]
Impacted Organization 1. Santander, NatWest, RBS, Lloyds, HSBC, and Halifax banks were impacted by the software failure incident [117521].
Software Causes 1. The software cause of the failure incident was a technical fault with Sky Broadband, which affected the ability of customers to access websites and apps, including online banking services [117521].
Non-software Causes 1. The failure incident was caused by a technical fault with Sky Broadband, affecting thousands of customers with major banks [117521].
Impacts 1. Thousands of customers with major banks like Santander, NatWest, RBS, Lloyds, HSBC, and Halifax were unable to use mobile apps and online banking for three hours [117521]. 2. Customers reported frustration on social media due to the inability to access websites and apps, affecting their ability to work from home and access banking services [117521]. 3. Some customers received error messages indicating their session had timed out and the server was not responding, further impacting their online activities [117521].
Preventions 1. Implementing robust redundancy and failover systems to ensure continuous service availability in case of broadband outages like the one experienced with Sky Broadband [117521]. 2. Conducting regular system checks and maintenance to proactively identify and address any potential technical faults that could lead to service disruptions [117521]. 3. Enhancing communication channels between service providers like Sky Broadband and affected banks to facilitate quicker resolution of issues and minimize customer impact [117521].
Fixes 1. Resolving the technical fault with Sky Broadband that caused the outage, as confirmed by Lloyds Banking Group and other banks [117521].
References 1. Sky Broadband spokesperson [117521] 2. Lloyds Banking Group [117521] 3. Santander [117521] 4. TSB [117521] 5. First Direct [117521] 6. HSBC [117521]

Software Taxonomy of Faults

Category Option Rationale
Recurring one_organization, multiple_organization (a) The software failure incident having happened again at one_organization: - Lloyds Banking Group, owner of Halifax, mentioned that the problem was due to a technical fault with Sky broadband, emphasizing that there was nothing wrong with their own services. This indicates a recurring issue with Sky Broadband affecting their services [117521]. (b) The software failure incident having happened again at multiple_organization: - Other banks such as Santander and TSB confirmed that the issue was with Sky customers trying to access the apps, suggesting a broader impact on multiple organizations due to the Sky Broadband failure [117521].
Phase (Design/Operation) design (a) The software failure incident in the article was related to the design phase. The issue was revealed to be with Sky Broadband, causing thousands of customers, including those from major banks like Santander, NatWest, RBS, Lloyds, HSBC, and Halifax, to be unable to use mobile apps and online banking for three hours. The problem was attributed to a technical fault with Sky broadband, impacting customers' ability to access websites and apps [117521]. (b) The software failure incident was not related to the operation phase or misuse of the system.
Boundary (Internal/External) within_system (a) within_system: The software failure incident reported in the article was within the system. The issue was revealed to be with Sky Broadband, which affected thousands of customers with major banks in the UK, causing online banking and mobile app outages [117521]. The technical fault with Sky broadband led to customers being unable to access websites and apps, resulting in frustration and complaints on social media. The problem originated within the Sky Broadband system and was resolved by the service provider. (b) outside_system: There is no information in the article to suggest that the software failure incident was due to contributing factors originating from outside the system.
Nature (Human/Non-human) non-human_actions (a) The software failure incident in this case was due to non-human actions. The issue was revealed to be with Sky Broadband, causing thousands of customers, including major banks like Santander, NatWest, RBS, Lloyds, HSBC, and Halifax, to be unable to use mobile apps and online banking for three hours [117521]. The problem was described as a technical fault with Sky broadband, and multiple customers reported issues connecting to websites and apps, with error messages indicating session timeouts and server unresponsiveness. The outage affected customers in major cities like London and Manchester, as well as across the UK. The issue was eventually resolved by Sky Broadband, allowing customers to access websites and apps as normal [117521]. (b) There is no specific information in the articles indicating that the software failure incident was due to contributing factors introduced by human actions.
Dimension (Hardware/Software) hardware (a) The software failure incident in the article was primarily due to hardware issues related to Sky Broadband. The outage affected thousands of customers, including major banks like Santander, NatWest, RBS, Lloyds, HSBC, and Halifax. The problem was attributed to a technical fault with Sky Broadband, causing customers to experience difficulties accessing websites and apps, including online banking services [117521]. (b) The software failure incident was not directly attributed to software issues but rather to the hardware issue with Sky Broadband. Customers reported issues such as session timeouts and servers not responding, which are more indicative of connectivity problems stemming from hardware rather than software bugs or faults [117521].
Objective (Malicious/Non-malicious) non-malicious (a) The software failure incident described in the article does not indicate any malicious intent. The issue was attributed to a technical fault with Sky Broadband, causing disruptions for customers of various banks and affecting their ability to access online banking and mobile apps [117521]. The incident appears to be non-malicious in nature.
Intent (Poor/Accidental Decisions) accidental_decisions (a) The software failure incident related to the Sky Broadband outage affecting online banking services of major banks in the UK was not attributed to poor decisions. The incident was primarily caused by a technical fault with Sky Broadband, leading to connectivity issues for customers trying to access websites and apps. The banks affected, such as Lloyds Banking Group, Santander, and TSB, confirmed that the problem was with Sky broadband and not their own services [117521]. (b) The software failure incident was more aligned with accidental decisions or mistakes rather than poor decisions. The outage was not a deliberate action but rather an unintended consequence of a technical fault with Sky Broadband, impacting the ability of customers to use online banking services [117521].
Capability (Incompetence/Accidental) accidental (a) The software failure incident reported in the article was not attributed to development incompetence. The issue was identified as a technical fault with Sky Broadband, affecting the ability of customers to access websites and apps, particularly impacting online banking services for customers of major banks like Santander, NatWest, RBS, Lloyds, HSBC, and Halifax [117521]. (b) The software failure incident was accidental, as it was caused by a technical fault with Sky Broadband rather than intentional actions or lack of professional competence. The outage left thousands of customers unable to use mobile apps and online banking for a few hours, impacting individuals working from home and causing frustration among affected users [117521].
Duration temporary (a) The software failure incident in this case was temporary. The issue with Sky Broadband caused thousands of customers, including those from major banks like Santander, NatWest, RBS, Lloyds, HSBC, and Halifax, to be unable to use mobile apps and online banking for three hours [117521]. The problem was specifically attributed to a technical fault with Sky Broadband, and once it was resolved, customers were able to access websites and apps as normal. The outage was not permanent and was resolved within a few hours.
Behaviour crash, omission, value, other (a) crash: The software failure incident in the article resulted in a crash as thousands of customers were left unable to use mobile apps and online banking due to the Sky Broadband outage [117521]. (b) omission: The omission behavior is evident in this incident as the system omitted to perform its intended functions at the instance of the outage, causing customers to be unable to access websites and apps [117521]. (c) timing: The timing behavior is not explicitly mentioned in the article. (d) value: The value behavior is observed in this incident as the system was performing its intended functions incorrectly, leading to customers experiencing issues with accessing websites and apps [117521]. (e) byzantine: The byzantine behavior is not described in the article. (f) other: The other behavior observed in this incident is the system causing frustration and inconvenience to customers due to the failure, as reported on social media by affected individuals [117521].

IoT System Layer

Layer Option Rationale
Perception None None
Communication None None
Application None None

Other Details

Category Option Rationale
Consequence property (d) property: People's material goods, money, or data was impacted due to the software failure The software failure incident related to the Sky Broadband outage affected thousands of customers with some of Britain's biggest banks, including Santander, NatWest, RBS, Lloyds, HSBC, and Halifax. Customers were unable to use mobile apps and online banking for three hours, leading to frustration and inconvenience. Many banking customers reported issues such as being unable to access websites, receiving error messages about session timeouts, and facing difficulties connecting to webpages, including work-related pages. The outage also affected Sky mobile customers, with reports of inability to access sites using Sky Broadband. Additionally, there were complaints about not being able to access bank accounts, indicating an impact on people's financial transactions and data security [117521].
Domain finance (a) The software failure incident affected the finance industry, specifically impacting customers of major banks like Santander, NatWest, RBS, Lloyds, HSBC, and Halifax who were unable to use mobile apps and online banking due to the Sky Broadband outage [Article 117521]. (h) The incident directly impacted the finance industry as customers were unable to access banking services online and through mobile apps, leading to frustration and complaints on social media platforms [Article 117521].

Sources

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