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On side firewall probably. Double check and if you have access to both sided compare firewall settings.<br />
It looks like File sharing is enable only one way.
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double checked both sites, compared the two, screen to screen, to no avail. Can not even ping :(
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For test only open all ports from WAN to VPN on affected site.
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yes, done that too ... strange strange :(
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How your VPN to VPn Matrix looks like ?<br />
<br />
I have Sonic 215 with working StS VPN and it looks like that<br />
<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/04_w14/1154879/Capture.JPG" target="_blank" title="Capture.JPG (62 KB)"><img alt="Capture.JPG" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2017/04_w14/800_1154879/Capture.JPG" /></a><br />
Compare on both sites
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Capture.JPG

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hi, same same. except for me i don't have the http management ...
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hi, i still could not, i have three sonicwalls - 2 of them already connect to the vpn, only this one is not working :( ... <br />
<br />
i nevertheless will award the marks for the kind and prompt assistance
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<div class="content wysiwyg-content">
hello, we have two sonicwalls TZ400 (main site) and TZ100 and wishing to do site-to-site. <br />
<br />
Both sites have green lights up. Traffic is ok (ping/files) from one site to main site. No traffic at all from main site to subsite. <br />
<br />
Both sites have been using the site-to-site vpn Wizard. Address group object recreated. VPN also recreated. <br />
<br />
I am running out of ideas. Please help.<br />
<br />
thanks, Clifford
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hello, we have two sonicwalls TZ400 (main site) and TZ100 and wishing to do site-to-site. 

Both sites have green lights up. Traffic is ok (ping/files) from one site to main site. No traffic at all from main site to subsite. 

Both sites have been using the site-to-site vpn Wizard. Address group object recreated. VPN also recreated. 

I am running out of ideas. Please help.

thanks, Clifford

sonicwall vpn green lights on both, but no traffic

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

SonicWall

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.