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Wich ports are allowed with Elisa's mobile internet 4G?


I've got a question to port forwarding using mobile internet 4G. So far Elisa was not providing us with real help, they left us staying in the rain.

Our treaty with Elisa is an "Elisa Yritysdata EU 200M 4G". Since May 2018 we have not found a solution for successful port forwarding, even with calling "gurus" from Elisa. We lost a lot of time and money. In the end we have got now a static IP address using the APN "kiintea4" in the profile of the modem. Still port forwarding doesn't work.

All settings of the 4G LTE modem are ok. The system protocol of the modem shows that the indented port was really opened when we made an entry in the forwarding list.

Testing for open ports from outside with a mobile device directed to our static address shows that Elisa is blocking ports. There is no other explanation.

Where can we get the information about the ports Elisa allows for running our own small servers in tiny IoT devices?

Previously we lived in another town and used a wired Elisa internet connection. With that it was not at all a problem to configure and use port forwarding.

Thanks in advance for helping.
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Vastauksen tähän kysymykseen jakoi Patomiäs 30 marraskuu 2018, 07:59

Hello xallixtus and welcome to OmaYhteisö! Sorry for the late response 😞 Only ports that are filtered in our network are 25 TCP, 7574 TCP, 1900 UDP/TCP, 53 UDP and 123(NTP) UDP. All of these are based on recommendations given by Viestintävirasto. You can find a bit more information about these filters from customer care site, unfortunately that site is only in Finnish, port filtering information is listed under "Elisan verkossa käytössä olevat porttisuodatukset" segment.

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Hello xallixtus and welcome to OmaYhteisö! Sorry for the late response 😞 Only ports that are filtered in our network are 25 TCP, 7574 TCP, 1900 UDP/TCP, 53 UDP and 123(NTP) UDP. All of these are based on recommendations given by Viestintävirasto. You can find a bit more information about these filters from customer care site, unfortunately that site is only in Finnish, port filtering information is listed under "Elisan verkossa käytössä olevat porttisuodatukset" segment.
Patomiäs, thank you very much for your wide explanations and the attached links to further information!
I guess the core of the trouble was the modem Huawei B525s-65a what seems not suitable to handle port forwarding and firewalling at the same time.
After we had brought a LTE-modem "Fritz!Box 6890" from Germany configuring port forwarding was a breeze.
Besides much more funtionality this modem allows to configure a DDNS-provider of your own choice. Huawei allows only for three preset providers.
We can recomend to buy the LTE 6890 modem instead of the Huawei if one likes to do a little more than only surfing the internet.

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