# Revisiting - System.IO.IOException: The specified server cannot perform the requested operation **URL:** https://forum.duplicati.com/t/revisiting-system-io-ioexception-the-specified-server-cannot-perform-the-requested-operation/7705 **Category:** Support **Created:** [August 5, 2019, 3:31am UTC](https://forum.duplicati.com/t/revisiting-system-io-ioexception-the-specified-server-cannot-perform-the-requested-operation/7705 "2019-08-05T03:31:18Z") **Posts on this page:** 1 **Showing post:** 6
### Author: ![ts678](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/t/8491ac/32.png) [@ts678](https://forum.duplicati.com/u/ts678) #### Post date: [August 10, 2019, 8:44pm UTC](https://forum.duplicati.com/t/revisiting-system-io-ioexception-the-specified-server-cannot-perform-the-requested-operation/7705/6 "2019-08-10T20:44:26Z")
> [@Daine](#): > > And you also noted that mounting the folder as CIFs worked for you. I can designate the shares to provide access via several protocols so that might be an option as well… If you’re referring to [this](https://forum.duplicati.com/t/unc-source-with-credentials/5085/6) it was to me not from me, however regardless of who said what, CIFS and SMB are loosely referring to the same thing (version difference exist, but might not be relevant to your usage). [The Difference between CIFS and SMB](https://www.ncanet.com/resources/news/industry-insights/the-difference-between-cifs-and-smb-feb-2014) discusses it. Regardless, it sounds like you had some success using your second-generation solution without having to change your service user. I hope that it holds up. --- _[View the full topic](https://forum.duplicati.com/t/revisiting-system-io-ioexception-the-specified-server-cannot-perform-the-requested-operation/7705)._