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Website access issue. Routing from branch through sonicwall to IIS webserver

Posted on 2008-06-23
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Last Modified: 2013-12-14
We have a IIS web server that is hosting a site which is behind a Sonicwall pro 3060 firewall in Michigan. Of the 20 odd branch locations throughout the south and west everyone can access the site but 4.  Of these four 3 have the same provider and 1 is different.  All can reach other resources behind the firewall in Michigan (email).  From the logs at the branches all traffic is leaving the firewall and going to the 1X. XX. network. In the log of the Sonicwall (Michigan)  an entry for on of the sites reads:

 06/23/2008 13:21:46.928  Alert , Intrusion Prevention,  IP spoof dropped, 6X.1XX.160.170, 38887, X1, 1X.XX.85.26, 80, X1, MAC address: 0X:1X:X3:Xc:f4:9c

6X.1XX.160.170 is the actual address from the branch and not a spoof. This may be a clue to solve the problem???

Where do I begin looking to try and isolate where the problem lies?
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Question by:kennedy2008
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by:oleggold
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kennedy2008 earned 0 total points
ID: 22215734
found solution.  Dual interfaces on the Sonicwall in the north routed traffic one way coming into network and routed different way leaving network.  Recieving vpn branch was looking for reply from one interface and not the other.
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