Index: zabbix-3.4.12-1+buster/src/zabbix_server/poller/checks_snmp.c
===================================================================
--- zabbix-3.4.12-1+buster.orig/src/zabbix_server/poller/checks_snmp.c
+++ zabbix-3.4.12-1+buster/src/zabbix_server/poller/checks_snmp.c
@@ -391,17 +391,7 @@ static int	zbx_get_snmp_response_error(c
 	{
 		zbx_snprintf(error, max_error_len, "Cannot connect to \"%s:%hu\": %s.",
 				interface->addr, interface->port, snmp_api_errstring(ss->s_snmp_errno));
-
-		switch (ss->s_snmp_errno)
-		{
-			case SNMPERR_UNKNOWN_USER_NAME:
-			case SNMPERR_UNSUPPORTED_SEC_LEVEL:
-			case SNMPERR_AUTHENTICATION_FAILURE:
-				ret = NOTSUPPORTED;
-				break;
-			default:
-				ret = NETWORK_ERROR;
-		}
+		ret = NETWORK_ERROR;
 	}
 	else if (STAT_TIMEOUT == status)
 	{