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Hardware Version :

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ISP :

I'm an installer that encounter quite a few times over this router due to our ISP is mainly using this model.
It seems that when i tried to create certificate over openvpn for this model, some are able to do so. But some do not.
Does the service provider has effect over this ?
I've encounter one of my customer using broadband that's copper type which is a assymetrical connection has trouble generating certificate for openvpn.
Both of my fibreoptic connection which is symetrical was able to generate certificate without issues.
However, under a different service provider that's also using symetrical fibreoptic broadband, certificate does not generate.

Anyone has any idea over this ?
Thanks.