VPN Error 1 when connecting from my ISP
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- Posts: 6
- Joined: Tue Jan 17, 2017 11:12 pm
VPN Error 1 when connecting from my ISP
Hello!
I've got a strange behaviour connecting to a SoftEther VPN Server.
My fiber connection is performed by Telecom Italia/TIM ISP, the main operator in Italy, using FFTB technology. Router is configured by my ISP (but I can modify some settings as well).
I'm trying to connect from the internal LAN behind this router to a SoftEther VPN Server which is connected by another ISP.
The problem is: when I connect from my own ISP internet connection I receive an "Error 1" and I cannot connect. While, connecting from others networks (or tethering too) I can connect as well.
Please note:
- I normally use my own ISP internet connection in order to connect also to some OpenVPN Servers without any problem.
- while using my own ISP internet connection, I can succesfully telnet without errors my vpnxxxxxx.softether.net 443 (cursor blnks).
- I'm using a Windows 10 box (full updated) and SoftEther 4.2.2 build 9634 x64
- while switching from my own ISP internet connection and Tethering (and back!) nothing was changed on settings
- my own ISP internet connection does not have any limitation, outgoing firewall or proxy.
- I tried to reinstall SoftEther and removing/readding the VPN virtual adapter too.
Thank you very much for your help and support!
I've got a strange behaviour connecting to a SoftEther VPN Server.
My fiber connection is performed by Telecom Italia/TIM ISP, the main operator in Italy, using FFTB technology. Router is configured by my ISP (but I can modify some settings as well).
I'm trying to connect from the internal LAN behind this router to a SoftEther VPN Server which is connected by another ISP.
The problem is: when I connect from my own ISP internet connection I receive an "Error 1" and I cannot connect. While, connecting from others networks (or tethering too) I can connect as well.
Please note:
- I normally use my own ISP internet connection in order to connect also to some OpenVPN Servers without any problem.
- while using my own ISP internet connection, I can succesfully telnet without errors my vpnxxxxxx.softether.net 443 (cursor blnks).
- I'm using a Windows 10 box (full updated) and SoftEther 4.2.2 build 9634 x64
- while switching from my own ISP internet connection and Tethering (and back!) nothing was changed on settings
- my own ISP internet connection does not have any limitation, outgoing firewall or proxy.
- I tried to reinstall SoftEther and removing/readding the VPN virtual adapter too.
Thank you very much for your help and support!
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- Posts: 2458
- Joined: Mon Feb 24, 2014 11:03 am
Re: VPN Error 1 when connecting from my ISP
Did you configure port forwarding at server side?
Is the session which success connection to the server in NAT traversal mode?
Is the session which success connection to the server in NAT traversal mode?
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- Posts: 6
- Joined: Tue Jan 17, 2017 11:12 pm
Re: VPN Error 1 when connecting from my ISP
thisjun,
first of all thank you for your answer!
1) port forwarding: yes, sure. Otherwise VPN could not work with a different Internet connection from the SAME pc.
2) NAT traversal mode: the settings are NOT changed between switching from one connection (not working) to the other one (which works).
BTW, NAT-T is enabled [edit: was "disabled" by my fault].
first of all thank you for your answer!
1) port forwarding: yes, sure. Otherwise VPN could not work with a different Internet connection from the SAME pc.
2) NAT traversal mode: the settings are NOT changed between switching from one connection (not working) to the other one (which works).
BTW, NAT-T is enabled [edit: was "disabled" by my fault].
Last edited by ilNebbioso on Thu Mar 02, 2017 9:28 am, edited 1 time in total.
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- Posts: 2458
- Joined: Mon Feb 24, 2014 11:03 am
Re: VPN Error 1 when connecting from my ISP
NAT-T is enabled in default setting.
Did you really disable NAT-T?
Did you really disable NAT-T?
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- Posts: 6
- Joined: Tue Jan 17, 2017 11:12 pm
Re: VPN Error 1 when connecting from my ISP
thisjun, hello and thank you for your reply.
No, I'm sorry. NAT-T is enabled (my fault). I'm going to correct my answer.
thisjun wrote:
> NAT-T is enabled in default setting.
> Did you really disable NAT-T?
No, I'm sorry. NAT-T is enabled (my fault). I'm going to correct my answer.
thisjun wrote:
> NAT-T is enabled in default setting.
> Did you really disable NAT-T?
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- Joined: Mon Feb 24, 2014 11:03 am
Re: VPN Error 1 when connecting from my ISP
I think your ISP blocks the TCP traffic. So, please try to change the port number or ask to the ISP.
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- Posts: 6
- Joined: Tue Jan 17, 2017 11:12 pm
Re: VPN Error 1 when connecting from my ISP
@thisJun,
teorically I agree with you. But, if I do:
telnet vpnxxxxx.softether.net 443
I receive a blinking cursor (it seems to be connected) also from my own ISP too.
teorically I agree with you. But, if I do:
telnet vpnxxxxx.softether.net 443
I receive a blinking cursor (it seems to be connected) also from my own ISP too.
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- Posts: 6
- Joined: Tue Jan 17, 2017 11:12 pm
Re: VPN Error 1 when connecting from my ISP
thisjun wrote:
> I think your ISP blocks the TCP traffic. So, please try to change the port number
> or ask to the ISP.
Any feedback to my latest answer, please!?
> I think your ISP blocks the TCP traffic. So, please try to change the port number
> or ask to the ISP.
Any feedback to my latest answer, please!?
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- Posts: 2458
- Joined: Mon Feb 24, 2014 11:03 am
Re: VPN Error 1 when connecting from my ISP
I think your ISP may use stateful packet inspection on the firewall.
https://en.wikipedia.org/wiki/Stateful_firewall
https://en.wikipedia.org/wiki/Stateful_firewall