I'll share some information about the bank error 102 you received, @anandhhardwarest.
This means your bank may be undergoing maintenance or server issues. I suggest updating your bank to refresh the connection and fix the error.
Here's how to do it:
After that, go back and check your downloaded transactions and if you're still getting the error. Follow Step 2 in this article: Fix bank errors 102 and 105.
Just in case you need help with other banking tasks, you can bookmark our Banking Articles for QuickBooks Online to view general banking topics with articles.
Feel free to leave a reply anytime if you still have questions or concerns about bank connections. I'm always here to assist you. Take care, and have a lovely day ahead.