The worldwide issue is causing problems across the South East including to travel and shops.
Issues have been reported at the Port of Dover and Gatwick Airport ahead of the school holidays getaway.
"We are using our backup process, but some passengers may experience delays while checking in and passing through security. Doug Bannister, chief executive at Port of Dover, told BBC Radio Sussex the port had fallen back on manual processes in some areas but most systems were working normally. "Ideally we'd like all the systems sorted again by then. Even if they're not we'll still be able to process through at a fairly normal rate."A Govia Thameslink spokesperson said IT teams were "actively investigating" to determine the root cause of the problem.
"We will provide additional updates when we can. In the meantime, please regularly check your journey before you travel."Royal Surrey County Hospital has declared a critical incident due to the issues which are affecting its radiotherapy services.
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