iPhone connection fails

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LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

iPhone connection fails

Post by LambdaEnt » Mon Jan 18, 2021 11:56 pm

Trying this again. Works with Mac and Windows clients. Will NOT work with iOS: VPN Connection fails.

If I do not enter a password on the iPhone, a dialog pops up asking for the password, so it IS communicating with the server, but it fails authentication.

Forwarded UDP ports: 139, 443, 500, 4500
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cedar
Site Admin
Posts: 1495
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Re: iPhone connection fails

Post by cedar » Tue Jan 19, 2021 11:15 am

If you open UDP/139, there is a high risk of being attacked, so close it immediately.
People all over the world can see your file share.

UDP / 443 is also not used, so let's close it.

It seems that the authentication settings are incorrect.
If you don't show me your settings, I won't know the cause.

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Tue Jan 19, 2021 5:50 pm

Thank you. I have closed those ports.

Here are some screen shots. iPhone is using L2TP. I have tried different encryption settings, none have worked with iOS. All work just fine with the desktops.
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cedar
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Re: iPhone connection fails

Post by cedar » Wed Jan 20, 2021 2:51 am

Since the problem occurs only on the iPhone, I think it is a setting problem on the iPhone side.
Is there a setting screen on the iPhone side?

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Wed Jan 20, 2021 3:39 am

Here's the screen. There's not much to it.
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cedar
Site Admin
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Re: iPhone connection fails

Post by cedar » Wed Jan 20, 2021 3:55 am

The secret must always be specified.

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Wed Jan 20, 2021 4:38 am

Both Password and Secret are filled in. Screen capture automatically blanks it out for security.

cedar
Site Admin
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Re: iPhone connection fails

Post by cedar » Wed Jan 20, 2021 4:45 am

Is there any message recorded in the server log of the VPN server when the connection fails?

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Wed Jan 20, 2021 4:56 am

I just now attempted to connect with the iPhone, which failed as before. The log recorded this:

2021-01-19,19:58:26.131,SID-LOCALBRIDGE-1,-,784561C36469,FFFFFFFFFFFF,0x0800,364,DHCPv4,Request,0.0.0.0,bootpc(68),255.255.255.255,bootps(67),-,-,TransactionId=1143420210 ClientIP=0.0.0.0 YourIP=0.0.0.0 ServerIP=0.0.0.0 RelayIP=0.0.0.0,-,-,-

cedar
Site Admin
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Re: iPhone connection fails

Post by cedar » Wed Jan 20, 2021 4:58 am

It seems to be part of the packet log.
There may be a record of incoming VPN connections in the server log.

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Wed Jan 20, 2021 5:22 am

I’ll check into it tomorrow and post it then. Thanks for your help.

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Wed Jan 20, 2021 7:38 pm

I just attempted to connect from the iPhone again. It failed, as usual.

But there was nothing at all generated in the server log.

cedar
Site Admin
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Joined: Sat Mar 09, 2013 5:37 am

Re: iPhone connection fails

Post by cedar » Thu Jan 21, 2021 1:33 am

Does your iPhone use the same network environment as other clients that successfully connect?
Your ISP can block IPsec, so please try using WiFi to match the network conditions with other clients.

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Thu Jan 21, 2021 8:06 am

Yes. Same network and router as my desktop that’s working just fine. I’ve tried it using cellular, too.

cedar
Site Admin
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Joined: Sat Mar 09, 2013 5:37 am

Re: iPhone connection fails

Post by cedar » Thu Jan 21, 2021 8:24 am

Are the iPhone and VPN Server on different networks?
If they are on the same, you may be in a hairpin NAT state.

It is also possible that there is a problem with the DNS settings.
Can you access the VPN Server from your iPhone browser?

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Thu Jan 21, 2021 8:38 am

I am connecting to the office where the server is, from my home desktop and iPhone. So, no, they are not in the same network.

I can connect using RemotePC and other software. It is not a DNS issue.
Last edited by LambdaEnt on Thu Jan 21, 2021 9:34 am, edited 1 time in total.

LambdaEnt
Posts: 28
Joined: Tue Jul 07, 2020 7:15 pm

Re: iPhone connection fails

Post by LambdaEnt » Thu Jan 21, 2021 9:25 am

Well, I just found the answer. iPhone does not like some non-alphanumeric characters, in this case a " (quote) in the Secret key. Changed it to a different character and voila!

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