Yeah, unfortunately if VPN providers are hosted in the same datacenters or the same IP ranges as people run their spambots and DDoS clients from, it's difficult to identify as legitimate use. A lot of VPN providers are hosting the spambots and DDoS clients, too; your provider may be one of them. I would let them know that their IPs are getting flagged by DDoS protection services and ask them to take a closer look at the type of traffic they're proxying in case it's one of their clients misbehaving.
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Yeah, unfortunately if VPN providers are hosted in the same datacenters or the same IP ranges as people run their spambots and DDoS clients from, it's difficult to identify as legitimate use. A lot of VPN providers are hosting the spambots and DDoS clients, too; your provider may be one of them. I would let them know that their IPs are getting flagged by DDoS protection services and ask them to take a closer look at the type of traffic they're proxying in case it's one of their clients misbehaving.