Client error - Could not determine IPv4/IPv6 protocol

Hi, I have a problem with two IPfire installations with openvpn. Basically they started reporting on the client side

Wed Jun 10 09:07:16 2020 MANAGEMENT:> STATE: 1591772836, RESOLVE ,
Wed Jun 10 09:07:16 2020 RESOLVE: Cannot resolve host address: xxxxx: 1194 (Unknown host.)
Wed Jun 10 09:07:16 2020 Could not determine IPv4 / IPv6 protocol
Wed Jun 10 09:07:16 2020 SIGUSR1 [soft, init_instance] received, process restarting
Wed Jun 10 09:07:16 2020 MANAGEMENT:> STATE: 1591772836, RECONNECTING, init_instance ,
Wed Jun 10 09:07:16 2020 Restart pause, 300 second (s)

I tried both as a name and as an IP address to connect but the result is always the same.
The serious error appears to be could not determine IPV4 / 6
I can get out of both regularly.
The versions are IPFire 2.21 (x86_64) - Core Update 124 on one and IPFire 2.21 (x86_64) - Core Update 131 on the other.

they stopped working at the same time

The versions are IPFire 2.21 (x86_64) - Core Update 124 on one and IPFire 2.21 (x86_64) - Core Update 131 on the other.

Both are heavily outdated. Please upgradee to Core Update 145 and try again.

ok

I try to make updates. I have a third firewall always with the same release that still works regularly. these two have worked until yesterday.

I upgraded to version 145 but the problem is still present.

The hostname could not resolved. Check the DNS.

I was thinking about this problem. On one of the two firewalls I set the IP address directly. The problem occurs on lines other than different clients.