What caused the latest temporary network issue for Colonial Pipeline?

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Colonial Pipeline Resolved Second Network Disruption Not Linked to Malware

Colonial Pipeline announced on May 29 that it had resolved a temporary network disruption that affected its systems. The company stated that this incident was not associated with malware, though the specific cause for the network issues was not immediately clear. This disruption marked the second such occurrence since the major ransomware attack earlier in May that had significantly impacted fuel deliveries.
Shippers Faced Nomination Entry Problems

During the network disruption, shippers encountered difficulties in entering and updating their nominations for fuel deliveries. This system functionality issue temporarily hindered the process of planning and executing shipments through the pipeline. The company confirmed that system functionality has since returned to normal.
No Malware Association Confirmed

Colonial Pipeline explicitly stated that the temporary network issue was not linked to malware. This clarification aimed to distinguish the incident from the earlier ransomware attack that had caused a widespread six-day outage. The precise technical or operational reasons behind this particular disruption remain unspecified.
Second Network Issue Since Ransomware Attack

This network problem was the second incident of its kind following the significant ransomware attack that crippled Colonial's operations earlier in May. The pipeline, which is the largest fuel system in the United States, accounts for millions of barrels of daily deliveries to the US East Coast and Southeast. The prior disruption, occurring shortly after operations were restored from the hack, was attributed by Colonial to efforts to strengthen its system, rather than a re-infection.

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What caused the latest temporary network issue for Colonial Pipeline?

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