In eB version 15.5.1 HF00341 Error message is received when uploading file (I’m sorry there was a problem performing the action ‘Upload ‘FILE NAME’’, an error occurred during th transfer. Error: Server Message: ‘The signature of the uploaded file does match that sent by the client’ HTP Error:500’)
BUG in ActiveX which is found in HF00341.
Uninstall “eB Web Client Controls” from client PC
Install “eB Web Client Controls” from not HF00341
In Web Server Replace ActiveX with previous version. You can download it from here. Extract downloaded zip file and copy eB.Control.Web.cab file to your Virtual directory, Framework folder (C:\inetpub\wwwroot\site_name\Framework).
Users who have previously downloaded the ActiveX might need to delete the files from their C:\Windows\Downloaded Program Fileslocation.
NOTE: This issue will be fixed in 15.6.1 release