I resolved this issue.
it was acyually down to an upgrade of my anti virus software - ESET that was blocking the IP address of the printer on my home network
I searched our online knowledge base for the error code you're receiving when scanning that may help fix the issue.
If you're still having issues after trying these steps please consider calling our support department for additional assistance.
I have recently upgraded my BT router to a BT Business Smart Hub 6.
Since then I have been unable to scan any documents and get error 018-755 server connection in SMB. I am using a Xerox VersaLink C405DN multifunctional printer.
I have tried the normal suggestions - ie obtaining the IPv4 address for the computer, ensuring the folder has correct permissions, checking the computer log in name / password is correct etc.
This was all working with the old BT router I was able to fix this problem previously when there was a change of IP addresses.
any advice gratefully received.