What is the reason of having this sdkclientexception connection timed out exception code example

Example: What is the reason of having this sdkclientexception connection timed out exception

com.amazonaws.SdkClientException: Unable to execute HTTP request: Connect to sns.us-west-2.amazonaws.com:443 [sns.us-west-2.amazonaws.com/52.119.170.155] failed: connect timed out
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleRetryableException(AmazonHttpClient.java:1175)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1121)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:770)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:744)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:726)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:686)
at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:668)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:532)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:512)
at com.amazonaws.services.sns.AmazonSNSClient.doInvoke(AmazonSNSClient.java:2800)
at com.amazonaws.services.sns.AmazonSNSClient.invoke(AmazonSNSClient.java:2767)
at com.amazonaws.services.sns.AmazonSNSClient.invoke(AmazonSNSClient.java:2756)
at com.amazonaws.services.sns.AmazonSNSClient.executeListTopics(AmazonSNSClient.java:1792)