fix(vpnunlimited): remove DEFAULT:@SECLEVEL=0

internal/configuration/settings/settings.go

@@ -167,8 +167,7 @@ func (s Settings) Warnings() (warnings []string) {
 			" so this will likely not work anymore. See https://github.com/qdm12/gluetun/issues/1498.")
 	}
 
-	if helpers.IsOneOf(*s.VPN.Provider.Name, providers.SlickVPN,
-		providers.VPNUnlimited) &&
+	if helpers.IsOneOf(*s.VPN.Provider.Name, providers.SlickVPN) &&
 		s.VPN.Type == vpn.OpenVPN {
 		warnings = append(warnings, "OpenVPN 2.5 uses OpenSSL 3 "+
 			"which prohibits the usage of weak security in today's standards. "+

internal/provider/vpnunlimited/openvpnconf.go

@@ -22,11 +22,5 @@ func (p *Provider) OpenVPNConfig(connection models.Connection,
 		},
 	}
 
-	// VPN Unlimited's certificate is sha1WithRSAEncryption and sha1 is now
-	// rejected by openssl 3.x.x which is used by OpenVPN >= 2.5.
-	// We lower the security level to 0 to allow this algorithm,
-	// see https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_security_level.html
-	providerSettings.TLSCipher = `"DEFAULT:@SECLEVEL=0"`
-
 	return utils.OpenVPNConfig(providerSettings, connection, settings, ipv6Supported)
 }