Not able upload bigger files on import

When i upload a file in data import it showing error as file disconnected. But files with very few entries ( Nearly 10 entries or 20kb files ) is getting uploaded.

Is there any file size limits for upload ?
Why it is happening so ?
How can i add a file with minimum 100 entries ??

Please help!!

Have a look at this post

I also recommend doing .CSV import instead of .xlsx
CSV tends to not hang the system, while xlsx often takes forever to finish if there are any mismatches in data types/requirements. When you do CSV, make sure that the types are matched - particularly dates need to have the same format as you use in the ERPNext DB