Open gate service reads "Kiinteä julkinen IP, kaksisuuntaisuus ja avoimet portit"
http://www.sonera.fi/etsi+apua+ja+tukea ... /open+gate
Just rang customer service port 25 and port 53 are closed.
I had a @450 service and all ports were open. Now I must move my mail server outside of the network behind the 3g modem. Is there some other way around this?
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Sonera Opengate APN allows traffic all others ports, but TCP port 25 (SMTP) and UDP port 53 are closed because of security issues, that true. I am sorry but there is no way to change this from APN service.
I guess the only way is to change ports from your mail server.
The only way I can think of is using VPN.
This is not feasible, as it would require reconfiguration of all email servers in the world, too.
Incoming mail now goes to a gateway/server outside of my network and from that server to my mail server on a port other than port 25.
I think port 25 should be open for OpenGate customers. I can understand if it is closed for a user who gets a new ip address every time they get a new connection . With a fixed ip address Sonera would be able to investigate and see who is abusing port 25.