You need to enable SMBv1 on your router as that is the only version of the protocol that Sonos support.

Buffalo have a KB about changing the SMB version here, though it also details how to enable v1 on Windows which is not recommended, but might be temporarily required if you are setting this up from a PC:

https://www.buffalotech.com/knowledge-base/windows-10-cannot-access-shares-on-nas

Hang on a sec, ignore my link above as I assumed “buffalo hd” was a router, but its a NAS by the looks of it. Check your router docs for switching SMB versions, if problems persist tell us exactly what router you are using.

The IP address 192.168.1.1 or 192.168.1.254 is usually used for the router.

your share “might” be \\buffalo_hd\music

Thanks for getting back, the IP address is the router (sonos refer to it as computer) the buffalo ministation is an external hd and is there when I log into router and described as BUFFALO-04113537, I've tried \\192.168.1.1\BUFFALO-04113537\music but the message I keep getting is that there is no share buffalo etc on the computer 192.168.1.1

Ok… an external USB Buffalo drive attached to your Talk Talk router…

have a look at the routers instructions for sharing a USB drive. Presume that your music is in a folder / directory called Music?

you may want to chsnge the name of the drive to be shorter such as “Buffalo” you can do this when its plugged in to a PC / Mac.

Ok I'm going to start again because there is a lot more that I've omitted. My main router is vm3 hub with no usb port, I have used an older router (talk talk) which does have a usb port, I have turned the older router into an access point via ethernet and connected the external hard drive, the main router has a different IP address to the older router, it works fine as an access point and I can log into both routers, the main router shows several devices inc sonos connected via ethernet although it actually isn't, the older router also shows the devices connected via wifi and shows the buffalo hd connected

Whats the ip of the main router and the ip of the older talktalk one?

Main router is 192.168 0.1 the older router I have now changed in order to configure as access point, same ssid same password but have made the ip static and assigned 192.168.0.11

When I try the talk talk router ip sonos recognises but doesn't recognise a share, if I try the ip from main router message is that it refuses to connect to sonos prod

So if your USB hard drive is connected to the old router the path would be...

\\192.168.0.11\buffalo_hd\music

Sonos

Yep tried that, but message says no share (buffalo) on computer 192.168.0.11

You need to dig out the instructions for the talktalkrouter and have a read.

using a computer you can browse your local network and see if there are any shares on the talktalk router.

really depends on what the drive is shared as, looking back it might be

\\192.168.0.11\BUFFALO-04113537\music

Ok I'll have a look although I have logged into the router and enabled the share options including samba, I'll keep trying, thanks for your input

Note that there are versions of Samba, Sonos currently uses only version 1, and not any of the later versions, as controlav mentioned in his initial response. 

Ok so if I disable it would that work??

Would you please define ‘it’?

If you mean Samba v1, then no, Sonos will no longer be able to reach your music library on your Buffalo Station NAS.

This has happened before. I can access streaming stations however I get message ‘cannot connect to//DESKTOP-PC/Music because the server cannot be found’ ( whenever I want to play ‘my music’ - I get all grey boxes. Suggestions please

Is that desktop turned on? Sonos wouldn’t  be able to see any music in that location if it couldn’t access the running hard drive. 

If it is, it might be worthwhile to delete the pointer to the music location from the Sonos ‘library’ function, and add it again. It’s possible that there was an update somewhere along the line that is causing issues. Forcing a new handshake, and a fresh scan of the music files certainly couldn’t hurt. 

Your help has been tremendous! Thank you so much-finally got the total music package going!