MCI WorldCom faces the wrath of up to 3,000 international customers, following a 10 day Frame Relay network outage that ended early last week.
MCI blamed the crash on a software upgrade to its Lucent switches. UK financial institutions were unable to trade in a key futures market because the Chicago Board of Trade (CBOT) was affected by the downtime.
As compensation for customers, MCI offered two days' free network use for every day the network was down.
A CBOT spokeswoman said: "MCI left us and our 3,600 customers extremely frustrated. We've not accepted the offer of compensation and legal recourse is still under review, as is our relationship."
Bernie Ebbers, president of MCI, apologised and admitted customer updates "didn't always meet customer expectations".
The problems occurred in an upgrade to Lucent's BSTDX 9000 Frame Relay switches and its CBX 500 ATM switches. The upgrade was expected to improve scalability and functionality of the network. Lucent said that this software works well on other carriers' networks which it declined to blame.
MCI had to reinstall the previous software to get the network back online and is still investing the exact cause of the outage.
For more stories see this week's issue of Network News UK
A nuclear strike has been considered, but Bruce Willis is nowhere in sight
Spray-on antenna could enable seamless integration of antennas with everyday objects
Parker Solar Probe, TESS and GOLD missions will deliver exciting data, claims NASA
But deep learning pulls ahead for complex tasks