myLittleAdmin does not use upload component, thus uploading large file will often fails. In order to backup/restore large db, please consider
myLittleBackup.
Anyway, there are a few things to check:
1. in your web.config file, check that the
executionTimeout and
maxRequestLength properties are correctly set
2. if you're using URLScan, URLScan has its own
maxRequestLength-like property. You need to update it too.
3. if you're using IIS7, by default in IIS 7
requestFiltering has the
MaxAllowedContentLength property enabled. It specifies, in bytes, the maximum length of the content in a request. The default is 30,000,000 (approximately 30 megabytes.)
To change this value you must edit the following file:
%windir%\System32\inetsrv\config\applicationHost.config.In the ApplicationHost.config file, locate the <requestLimits> node.
Modify the following code.
<requestLimits maxAllowedContentLength ="209715200" /> (Note that maxAllowedContentLength is in bytes, 209715200 is around 200 Mb)
Hope this helps