OpenVPN for Android resolve problems

[MCLaesser]

Hello
I'm a great fan of OpenVPN for Android and I'm using the application on my Google Pixel 6a (Android 15) for a very long time.

I have to different OpenVPN Server running both are using freedns.afraid.org with "Dynamic DNS" service on my opnsense firewall because I don't have static ip addresses. This setup was working for years. I don't know but it might be that since the last security update from 5 March 2025 both VPN Profiles with two completely different OpenVPN Serves on my smartphone won't work anymore.

I'm getting a DNS resolve error on the screen like

​2025-03-17 15:17:40 official build 0.7.55 running on google Pixel 6a (bluejay), Android 15 (BP1A.250305.019) API 35, ABI arm64-v8a, (google/bluejay/bluejay:15/BP1A.250305.019/13003188:user/release-keys)
2025-03-17 15:17:46 Building configuration…
2025-03-17 15:17:46 Fetched VPN profile (Office) triggered by Reconnect button pressed.
2025-03-17 15:17:46 Scheduling VPN keep alive for VPN Office
2025-03-17 15:17:46 started Socket Thread
...
2025-03-17 15:17:47 MANAGEMENT: >STATE:1742221067,RESOLVE,,,,,,
2025-03-17 15:17:47 RESOLVE: Cannot resolve host address: xxx.mooo.com:1194 (No address associated with hostname)
2025-03-17 15:17:47 Data Channel MTU parms [ mss_fix:0 max_frag:0 tun_mtu:1500 tun_max_mtu:1600 headroom:136 payload:1768 tailroom:562 ET:0 ]
2025-03-17 15:17:47 MANAGEMENT: >STATE:1742221067,RESOLVE,,,,,,
2025-03-17 15:17:47 RESOLVE: Cannot resolve host address: xxx.mooo.com:1194 (No address associated with hostname)
2025-03-17 15:17:47 Could not determine IPv4/IPv6 protocol
2025-03-17 15:17:47 SIGUSR1[soft,Could not determine IPv4/IPv6 protocol] received, process restarting
2025-03-17 15:17:47 MANAGEMENT: >STATE:1742221067,RECONNECTING,Could not determine IPv4/IPv6 protocol,,,,,
2025-03-17 15:17:47 Waiting 2s seconds between connection attempt
2025-03-17 15:17:52 MANAGEMENT: CMD 'hold release'
2025-03-17 15:17:52 MANAGEMENT: CMD 'bytecount 2'
2025-03-17 15:17:52 MANAGEMENT: CMD 'state on'
2025-03-17 15:17:52 MANAGEMENT: CMD 'proxy NONE'
2025-03-17 15:17:53 Re-using SSL/TLS context
2025-03-17 15:17:53 Outgoing Control Channel Authentication: Using 512 bit message hash 'SHA512' for HMAC authentication
2025-03-17 15:17:53 Incoming Control Channel Authentication: Using 512 bit message hash 'SHA512' for HMAC authentication
2025-03-17 15:17:53 Control Channel MTU parms [ mss_fix:0 max_frag:0 tun_mtu:1250 tun_max_mtu:0 headroom:126 payload:1600 tailroom:126 ET:0 ]
2025-03-17 15:17:53 MANAGEMENT: >STATE:1742221073,RESOLVE,,,,,,
2025-03-17 15:17:53 RESOLVE: Cannot resolve host address: xxx.mooo.com:1194 (No address associated with hostname)
2025-03-17 15:17:53 Data Channel MTU parms [ mss_fix:0 max_frag:0 tun_mtu:1500 tun_max_mtu:1600 headroom:136 payload:1768 tailroom:562 ET:0 ]
2025-03-17 15:17:53 MANAGEMENT: >STATE:1742221073,RESOLVE,,,,,,
2025-03-17 15:17:53 RESOLVE: Cannot resolve host address: xxx.mooo.com:1194 (No address associated with hostname)
2025-03-17 15:17:53 Could not determine IPv4/IPv6 protocol
2025-03-17 15:17:53 SIGUSR1[soft,Could not determine IPv4/IPv6 protocol] received, process restarting
2025-03-17 15:17:53 MANAGEMENT: >STATE:1742221073,RECONNECTING,Could not determine IPv4/IPv6 protocol,,,,,
2025-03-17 15:17:53 Waiting 2s seconds between connection attempt

If I doublecheck with dnschecker.org both hostnames can be resolved also on my Windows PC with OpenVPN Client no problem to connect to both VPN Servers. For test reason I installed OpenVPN Connect on my Pixel 6a because you mentioned it somewhere in your app. To my surprise the problem doesn't exist in the OpenVPN Connect and I can connect to both VPN Servers without any problems.

Because I like the handling of OpenVPN for Android a lot more I would like to fix the issue.

Do you have any idea why host resolution doesn't work anymore?

Thank you very much for a quick answer.

Kind regards Manuel

[schwabe]

Am 17.03.25 um 15:36 schrieb MCLaesser:

Hello I'm a great fan of OpenVPN for Android and I'm using the application on my Google Pixel 6a (Android 15) for a very long time. I have to different OpenVPN Server running both are using freedns.afraid.org with "Dynamic DNS" service on my opnsense firewall because I don't have static ip addresses. This setup was working for years. I don't know but it might be that since the last security update from 5 March 2025 both VPN Profiles with two completely different OpenVPN Serves on my smartphone won't work anymore. I'm getting a DNS resolve error on the screen like ​2025-03-17 15:17:40 official build 0.7.55 running on google Pixel 6a (bluejay), Android 15 (BP1A.250305.019) API 35, ABI arm64-v8a, (google/ bluejay/bluejay:15/BP1A.250305.019/13003188:user/release-keys) 2025-03-17 15:17:46 Building configuration… 2025-03-17 15:17:46 Fetched VPN profile (Office) triggered by Reconnect button pressed. 2025-03-17 15:17:46 Scheduling VPN keep alive for VPN Office 2025-03-17 15:17:46 started Socket Thread ... 2025-03-17 15:17:47 MANAGEMENT: >STATE:1742221067,RESOLVE,,,,,, 2025-03-17 15:17:47 RESOLVE: Cannot resolve host address: xxx.mooo.com:1194 (No address associated with hostname) 2025-03-17 15:17:47 Data Channel MTU parms [ mss_fix:0 max_frag:0 tun_mtu:1500 tun_max_mtu:1600 headroom:136 payload:1768 tailroom:562 ET:0 ] 2025-03-17 15:17:47 MANAGEMENT: >STATE:1742221067,RESOLVE,,,,,, 2025-03-17 15:17:47 RESOLVE: Cannot resolve host address: xxx.mooo.com:1194 (No address associated with hostname) 2025-03-17 15:17:47 Could not determine IPv4/IPv6 protocol 2025-03-17 15:17:47 SIGUSR1[soft,Could not determine IPv4/IPv6 protocol] received, process restarting 2025-03-17 15:17:47 MANAGEMENT: >STATE:1742221067,RECONNECTING,Could not determine IPv4/IPv6 protocol,,,,, 2025-03-17 15:17:47 Waiting 2s seconds between connection attempt 2025-03-17 15:17:52 MANAGEMENT: CMD 'hold release' 2025-03-17 15:17:52 MANAGEMENT: CMD 'bytecount 2' 2025-03-17 15:17:52 MANAGEMENT: CMD 'state on' 2025-03-17 15:17:52 MANAGEMENT: CMD 'proxy NONE' 2025-03-17 15:17:53 Re-using SSL/TLS context 2025-03-17 15:17:53 Outgoing Control Channel Authentication: Using 512 bit message hash 'SHA512' for HMAC authentication 2025-03-17 15:17:53 Incoming Control Channel Authentication: Using 512 bit message hash 'SHA512' for HMAC authentication 2025-03-17 15:17:53 Control Channel MTU parms [ mss_fix:0 max_frag:0 tun_mtu:1250 tun_max_mtu:0 headroom:126 payload:1600 tailroom:126 ET:0 ] 2025-03-17 15:17:53 MANAGEMENT: >STATE:1742221073,RESOLVE,,,,,, 2025-03-17 15:17:53 RESOLVE: Cannot resolve host address: xxx.mooo.com:1194 (No address associated with hostname) 2025-03-17 15:17:53 Data Channel MTU parms [ mss_fix:0 max_frag:0 tun_mtu:1500 tun_max_mtu:1600 headroom:136 payload:1768 tailroom:562 ET:0 ] 2025-03-17 15:17:53 MANAGEMENT: >STATE:1742221073,RESOLVE,,,,,, 2025-03-17 15:17:53 RESOLVE: Cannot resolve host address: xxx.mooo.com:1194 (No address associated with hostname) 2025-03-17 15:17:53 Could not determine IPv4/IPv6 protocol 2025-03-17 15:17:53 SIGUSR1[soft,Could not determine IPv4/IPv6 protocol] received, process restarting 2025-03-17 15:17:53 MANAGEMENT: >STATE:1742221073,RECONNECTING,Could not determine IPv4/IPv6 protocol,,,,, 2025-03-17 15:17:53 Waiting 2s seconds between connection attempt If I doublecheck with dnschecker.org both hostnames can be resolved also on my Windows PC with OpenVPN Client no problem to connect to both VPN Servers. For test reason I installed OpenVPN Connect on my Pixel 6a because you mentioned it somewhere in your app. To my surprise the problem doesn't exist in the OpenVPN Connect and I can connect to both VPN Servers without any problems. Because I like the handling of OpenVPN for Android a lot more I would like to fix the issue. Do you have any idea why host resolution doesn't work anymore?

You probably have lport 0 in your config from Opnsense. Either remove that from your config or opt in for the current beta that should fix that. Arne

[MCLaesser]

Good morning Arne
Many thank for your hint. I removed lport 0 from my config file and the name resolution is working again. Many many thanks.

Regards Manuel