Ulster Bank, a subsidiary of Royal Bank of Scotland (RBS), has reportedly fixed the technical problems that once again hit its online payments processing services causing delays in inbound and outbound transactions for euro customers.

Ulster Bank said the problem has been identified and resolved, and the affected customers would be compensated.

"Some files were delayed through our payment system overnight and these payments have now been made.

"We apologise for this delay and if any customers have been left out of pocket, we will put this right," the bank said.

The technology glitch comes a week after RBS reported failure in its IT systems on Cyber Monday, the busiest shopping day in the year, and days after the British bank was hit by a Distributed Denial of Service attack that disrupted online services for over one hour.

On Cyber Monday, around 750,000 RBS, NatWest and Ulster Bank customers were assumed to be affected due to the technology glitch.

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In summer 2012, Ulster Bank faced similar a situation, where customers were unable to access their accounts for several days, forcing the bank to pay more than £120m in compensation.