I guess many students might be knowing that students who have scheduled F-1 Visa Interview on 22nd June got a mail from the US Embassy stating their Visa Interview has been rescheduled. The US Consulate has given an official reason explaining the reason for rescheduling in their official website.
I am just pasting their official reason below so that you can get to know why this happened. I have also attached the US Consulate mail that students received regarding Rescheduling.
US Consulate Email
Check this post regarding Rescheduling and things you need to do
Official Reason for Rescheduling
The Department of State’s Bureau of Consular Affairs is currently experiencing technical problems with our overseas passport and visa systems. This issue is not specific to any particular country, citizenship document, or visa category. We apologize for the inconvenience and are working urgently to correct the problem and restore full operability.
Applications for a U.S. visa made after June 8, 2015, are also affected by this delay. Nonimmigrant visa applicants who did not submit their DS-160 online application prior to June 9, 2015, should reschedule their interview appointments. Individuals with urgent travel should follow the instructions for expedited emergency appointment found on this website.
Due to unexpected system issues, your photograph taken at the Visa Application Center (VAC) might not have transmitted correctly. Please bring a recent visa photograph to your visa interview. Visa photo specifications are at: http://www.ustraveldocs.com/in/in-niv-photoinfo.asp#picsreqs
Due to unforeseen circumstances, the Non-Immigrant Unit of the Chennai Consulate will not be able to honor your appointment on June 22, 2015. You will have to reschedule your existing appointment at the Visa Application Center for your biometric enrolment and your interview appointment at the Consulate. There is NO need to contact the call center or customer support—simply login to your profile and reschedule both of your appointments. We regret the inconvenience caused.
Due to scheduling changes, The U.S. Consulate Hyderabad will be closed to the public on June 22, 2015. We will not be able to conduct your interview at the scheduled time on this day. You are requested to attend your Finger Print appointment as per the scheduled date at the Visa Application Center and attend your U.S. Consulate Interview on 24th June 2015. Please note that only the appointment date is changed, but the interview time remains the same. There is NO need to contact the call center or customer support. We regret the inconvenience caused.