Isle of Wight ferry firm Wightlink is experiencing disruption on its Portsmouth to Fishbourne car ferry.
The company is blaming a technical issue on one of its vessels.
There are currently delays of up to two hours.
A spokesperson apologised for inconvenience.
They said: "We'll keep you updated as our teams work hard to return to our scheduled timetable."
Wightlink's other services are operating on time.
Updated
Wightlink has said there are now delays of up to four hours.
Updated 12.15pm
The technical issue has been resolved.
There are still delays of an hour.
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