Update messages

Author: dragetd

CHANGES.md

@@ -14,6 +14,7 @@
 * `hasher` will no longer create a directory if a non-existing one is passed as an argument.
 * trivrost will no longer attempt to repeat range requests to a host after it has failed to conformly respond while displaying the confusing message `Taking longer than usual: HTTP Status 200` and will now fail immediately in such cases instead.
 * trivrost will no longer fail to comply with HTTP 2 strictly using lower-case HTTP Header names. This had been caused by methods of `http.Header` still being oriented around HTTP 1 canonical header names due to Go's backwards compatibility promise.
+* Instead of always showing 'Cannot reach server' to the user, show more precise/useful messages on connection issues.
 
 ## 1.4.6 (2021-01-25)
 ### Fixes

cmd/launcher/gui/gui_progress_handler.go

@@ -75,11 +75,11 @@ func (handler *GuiDownloadProgressHandler) HandleHttpGetError(fromURL string, er
 	handler.problemUrl = fromURL
 
 	if strings.Contains(err.Error(), "x509: ") {
-		NotifyProblem("Certificate verification problem", false)
-	} else if strings.Contains(err.Error(), "timed out") {
-		NotifyProblem("Timeout reaching server", false)
+		NotifyProblem("Certificate (X.509) problem", false)
+	} else if strings.Contains(err.Error(), "dial tcp: lookup") && strings.Contains(err.Error(), "no such host") {
+		NotifyProblem("Unable to resolve hostname", false)
 	} else {
-		NotifyProblem("Problems reaching server", false)
+		NotifyProblem("Connection problem", false)
 	}
 }