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RED10 Sites and SSLVPN Users have issues trying to copy files from main site... Any ideas how to fix?

DonV

I hope someone can point me in the right direction if this has been looked at in another forum...

I have a main site with a UTM 220 and multiple connected sites with RED10s and multiple users connecting to the main site using SSLVPN from home.  When ANY of these users try to copy files from the main server (PDF, CAD, any type really) using Windows drag and drop over a UNC network drive [G: being \\headofficeserver\common] to their own desktop the file transfer fails 9 times out of 10 with the standard 'Network connection no longer exists' or 'Cant find drive' etc...

They can use FTP to connect to our FTP server (on site, same network as G drive host) and transfer 700Mb files without failure.

I thought it was a protocol issue, I thought it was a MTU issue, I thought it was a UTM issue, I thought it was a Microsoft issue, but I can't seem to rule any of it out 100%.

I turned off ATP, IP,AC,and Web Filtering individually and all at the same time.  Same thing...

I appreciate any suggestions!

Thanks,



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    Update:  With a bit of SOPHOS support... I got it figured.

    I contacted SOPHOS support to start trouble shooting this and when going through some basic FW checks, one of the live logs we watched during testing mentioned SMB-over-TCP.  It triggered memories about the same topic I researched earlier because I though this issue was SMB Windows related...  Well I took another look as we didn't get anywhere w Support, and then I came across an old 2006 post out there which discussed my exact issues [new search criteria].  Turns out that introduced to Vista was some tweaks as to how SMB works [read that before, no solutions provided] and the short of it is, SMB and NAT don't work together over VPN.  So I deleted all my NAT settings that had anything to do with my VPN and RED connections and voila users can file transfer through Explorer again without crashing.  I was on the right track just didn't have all the pieces in place...

    Thanks for reading.  Now on to the next tweak I need to figure out!!

    DV

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    Update:  With a bit of SOPHOS support... I got it figured.

    I contacted SOPHOS support to start trouble shooting this and when going through some basic FW checks, one of the live logs we watched during testing mentioned SMB-over-TCP.  It triggered memories about the same topic I researched earlier because I though this issue was SMB Windows related...  Well I took another look as we didn't get anywhere w Support, and then I came across an old 2006 post out there which discussed my exact issues [new search criteria].  Turns out that introduced to Vista was some tweaks as to how SMB works [read that before, no solutions provided] and the short of it is, SMB and NAT don't work together over VPN.  So I deleted all my NAT settings that had anything to do with my VPN and RED connections and voila users can file transfer through Explorer again without crashing.  I was on the right track just didn't have all the pieces in place...

    Thanks for reading.  Now on to the next tweak I need to figure out!!

    DV

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