Yes....Reason click here
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DUE TO MAINTENANCE ACTIVITIES BOOKING OF BOTH I-TICKETS AND E-TICKETS AND CANCELLATION OF E-TICKETS WILL NOT BE AVAILABLE FROM 16:30 HRS TO 17:30 HRS IST (GMT + 0530) TODAY. INCONVENIENCE CAUSED IS DEEPLY REGRETTED.
INCASE...
more... YOU ARE GETTING THE DOWNTIME MESSAGE AFTER THE TIME MENTIONED ABOVE, KINDLY CLOSE ALL THE BROWSER WINDOWS, OPEN A NEW ONE AND DELETE TEMPORARY INTERNET FILES AS MENTIONED BELOW.
eg. For Internet Explorer, Go to Tools menu -> Internet options -> delete cookies, delete files, clear history and click ok.