Tasmanian students are among those whose NAPLAN tests were interrupted on Tuesday due to technology and "connectivity issues".
Schools in Tasmania and across Australia have been gradually migrating to the NAPLAN Online tests, which is a departure from the original paper tests conducted in previous years.
It's believed all schools will have migrated to the technology by next year.
A statement posted to the NAPLAN website said a number of schools experienced "connectivity issues".
However, it is unknown whether those students will have to resit the tests or when they are likely to resit the standardised testing program.
"A number of schools have experienced some connectivity issues on the first day of NAPLAN. If technical issues or anything unexpected does occur, there are procedures in place to manage any issues and ensure that all students are able to take the test, including taking the test on paper as a last resort," a NAPLAN spokesman said.
About 50 per cent of schools across the country have migrated taking the assessments online compared to 15 per cent last year.
More than 350,000 NAPLAN online tests were successfully submitted on the first day.
"The technology and logistics of a national online project of this size are highly complex. Schools are familiar with these processes. However, inconvenience to schools and students during testing is regretted," the spokesman said.
The Tasmanian Education Department has been contacted for comment.