diff --git a/src/main/java/cz/cvut/kbss/analysis/config/conf/OperationalDataConfig.java b/src/main/java/cz/cvut/kbss/analysis/config/conf/OperationalDataConfig.java
index d897788..7e665ff 100644
--- a/src/main/java/cz/cvut/kbss/analysis/config/conf/OperationalDataConfig.java
+++ b/src/main/java/cz/cvut/kbss/analysis/config/conf/OperationalDataConfig.java
@@ -1,6 +1,5 @@
 package cz.cvut.kbss.analysis.config.conf;
 
-import cz.cvut.kbss.analysis.util.ConfigParam;
 import lombok.Getter;
 import lombok.Setter;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -17,10 +16,14 @@
 public class OperationalDataConfig {
 
     protected Double minOperationalHours;
+     protected String operationalDataServer;
+    protected String operationaDataServerCheck;
     protected String operationalFailureRateService;
 
     @Autowired
     public OperationalDataConfig(Environment env) {
-        operationalFailureRateService = env.getProperty("operationalFailureRateService");
+        operationalDataServer = env.getProperty("operationalDataServer");
+        operationaDataServerCheck = env.getProperty("operationaDataServerCheck", "check");
+        operationalFailureRateService = env.getProperty("operationalFailureRateService", "failure-rate");
     }
 }
diff --git a/src/main/java/cz/cvut/kbss/analysis/controller/OperationalDataFilterController.java b/src/main/java/cz/cvut/kbss/analysis/controller/OperationalDataFilterController.java
index b6da332..18dbf49 100644
--- a/src/main/java/cz/cvut/kbss/analysis/controller/OperationalDataFilterController.java
+++ b/src/main/java/cz/cvut/kbss/analysis/controller/OperationalDataFilterController.java
@@ -3,6 +3,7 @@
 import cz.cvut.kbss.analysis.model.opdata.OperationalDataFilter;
 import cz.cvut.kbss.analysis.service.IdentifierService;
 import cz.cvut.kbss.analysis.service.OperationalDataFilterService;
+import cz.cvut.kbss.analysis.service.external.OperationalDataService;
 import cz.cvut.kbss.analysis.util.Vocabulary;
 import cz.cvut.kbss.jsonld.JsonLd;
 import lombok.extern.slf4j.Slf4j;
@@ -20,10 +21,12 @@ public class OperationalDataFilterController {
 
     private final OperationalDataFilterService filterService;
     private final IdentifierService identifierService;
+    private final OperationalDataService operationalDataService;
 
-    public OperationalDataFilterController(OperationalDataFilterService filterService, IdentifierService identifierService) {
+    public OperationalDataFilterController(OperationalDataFilterService filterService, IdentifierService identifierService, OperationalDataService operationalDataService) {
         this.filterService = filterService;
         this.identifierService = identifierService;
+        this.operationalDataService = operationalDataService;
     }
 
     @PutMapping(path="reset", produces = {JsonLd.MEDIA_TYPE, MediaType.APPLICATION_JSON_VALUE})
@@ -46,4 +49,9 @@ public void updateFaultTreeFilter(@PathVariable(name = "faultTreeFragment") Stri
         URI faultTreeUri = identifierService.composeIdentifier(Vocabulary.s_c_fault_tree, faultTreeFragment);
         filterService.updateFaultTreeFilter(faultTreeUri, filter);
     }
+
+    @GetMapping(value = "/check-service", produces = {MediaType.TEXT_PLAIN_VALUE})
+    public String checkOperationalDataService(){
+        return operationalDataService.checkConnection();
+    }
 }
diff --git a/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeRepositoryService.java b/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeRepositoryService.java
index 9207466..7bf745a 100755
--- a/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeRepositoryService.java
+++ b/src/main/java/cz/cvut/kbss/analysis/service/FaultTreeRepositoryService.java
@@ -540,6 +540,8 @@ public void updateFaultTreeOperationalFailureRates(FaultTree faultTree, Operatio
             return;
 
         ItemFailureRate[] operationalFailureRateEstimates = operationalDataService.fetchFailureRates(filter, map.keySet());
+        if(operationalFailureRateEstimates == null)
+            return;
 
         URI systemContext = getToolContext(faultTree.getSystem().getUri());
         for(ItemFailureRate estimate : operationalFailureRateEstimates){
diff --git a/src/main/java/cz/cvut/kbss/analysis/service/external/OperationalDataService.java b/src/main/java/cz/cvut/kbss/analysis/service/external/OperationalDataService.java
index 91184c0..1752b63 100644
--- a/src/main/java/cz/cvut/kbss/analysis/service/external/OperationalDataService.java
+++ b/src/main/java/cz/cvut/kbss/analysis/service/external/OperationalDataService.java
@@ -29,10 +29,41 @@ public OperationalDataService(OperationalDataConfig operationalDataConfig, Opera
         this.restTemplate = restTemplate;
     }
 
+    protected String getApi(String api){
+        String serverUri = operationalDataConfig.getOperationalDataServer();
+        return api == null || serverUri == null ? null : serverUri + api;
+    }
+
+
+    protected String getCheckApi(){
+        return getApi(operationalDataConfig.getOperationaDataServerCheck());
+    }
+
+    protected String getFailureRateApi(){
+        return getApi(operationalDataConfig.getOperationalFailureRateService());
+    }
+
+    public String checkConnection(){
+        String apiURI = getCheckApi();
+        if(apiURI == null) return "not connected";
+        try {
+            return restTemplate.getForObject(apiURI, String.class);
+        } catch (Exception e){
+            log.warn("Failed to fetch failure rates from " + apiURI, e);
+        }
+        return "not working";
+    }
+
     public ItemFailureRate[] fetchFailureRates(OperationalDataFilter filter, Collection<URI> components){
-        String apiURI = operationalDataConfig.getOperationalFailureRateService();
-        Map<String, Object> uriParams = new HashMap<>();
-        uriParams.put("minOperationalTime", filter.getMinOperationalHours());
-        return restTemplate.postForObject(apiURI, components, ItemFailureRate[].class, uriParams);
+        String apiURI = getFailureRateApi();
+        if(apiURI == null) return null;
+        try {
+            Map<String, Object> uriParams = new HashMap<>();
+            uriParams.put("minOperationalTime", filter.getMinOperationalHours());
+            return restTemplate.postForObject(apiURI, components, ItemFailureRate[].class, uriParams);
+        } catch (Exception e){
+            log.warn("Failed to fetch failure rates from \"{}\" \nerror message: {}", apiURI, e.getMessage());
+        }
+        return null;
     }
 }
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 971cf68..bd4d475 100755
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -41,4 +41,6 @@ spring:
 operational.data.filter:
   min-operational-hours: 200
 
-operationalFailureRateService: https://kbss.onto.fel.cvut.cz/ava/services/ava-analytics/stats/failire-rate
\ No newline at end of file
+operationalDataServer: https://kbss.felk.cvut.cz/ava/services/ava-analytics/stats/
+operationaDataServerCheck: check
+operationalFailureRateService: failure-rate
\ No newline at end of file