I recently replaced a customers Netgear FVS318 Router with a Mikrotik RB750. After replacing the router they could no longer reliably ftp files to one particular site.
The routinely ftp to about 5 sites a week and are not having any issues with any of the other sites. Only this one site. Their external IP is the same. If I put the Netgear back in they can ftp to all sites.
We have already tried multiple ftp clients, using passive mode, regular mode. Nothing seems to work except putting the old router back in.
Any help here?