Anyone wanting to book their ferry trip with CalMac will be unable to do so from 6pm Tuesday 9 October to 6pm on Wednesday 10 October.
CalMac cite essential maintenance to their servers as the reason. They said: "During this period, you will be unable to make or amend a reservation, through our Customer Contact Centre or in our ports. Online reservations will also be unavailable.
"Please make or amend your reservation outwith this maintenance period.
"Tickets for immediate travel during this time will be available at our ports."
Further information can be found here.