diff --git a/proxy/http/HttpTransact.cc b/proxy/http/HttpTransact.cc
index d25cb376fa7..2eb1c89f4a5 100644
--- a/proxy/http/HttpTransact.cc
+++ b/proxy/http/HttpTransact.cc
@@ -48,6 +48,11 @@
 #include "../IPAllow.h"
 #include "I_Machine.h"
 
+namespace
+{
+char const Dns_error_body[] = "connect#dns_failed";
+}
+
 // Support ip_resolve override.
 const MgmtConverter HttpTransact::HOST_RES_CONV{[](const void *data) -> std::string_view {
                                                   const HostResData *host_res_data = static_cast<const HostResData *>(data);
@@ -1899,7 +1904,7 @@ HttpTransact::ReDNSRoundRobin(State *s)
   } else {
     // Our ReDNS failed so output the DNS failure error message
     // Set to internal server error so later logging will pick up SQUID_LOG_ERR_DNS_FAIL
-    build_error_response(s, HTTP_STATUS_INTERNAL_SERVER_ERROR, "Cannot find server.", "connect#dns_failed");
+    build_error_response(s, HTTP_STATUS_INTERNAL_SERVER_ERROR, "Cannot find server.", Dns_error_body);
     s->cache_info.action = CACHE_DO_NO_ACTION;
     s->next_action       = SM_ACTION_SEND_ERROR_CACHE_NOOP;
     //  s->next_action = PROXY_INTERNAL_CACHE_NOOP;
@@ -8144,7 +8149,11 @@ HttpTransact::build_error_response(State *s, HTTPStatus status_code, const char
     SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_SERVER);
     break;
   case HTTP_STATUS_INTERNAL_SERVER_ERROR:
-    SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_DNS_FAILURE);
+    if (Dns_error_body == error_body_type) {
+      SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_DNS_FAILURE);
+    } else {
+      SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_UNKNOWN);
+    }
     break;
   case HTTP_STATUS_MOVED_TEMPORARILY:
     SET_VIA_STRING(VIA_ERROR_TYPE, VIA_ERROR_MOVED_TEMPORARILY);
diff --git a/proxy/http/HttpTransact.h b/proxy/http/HttpTransact.h
index 4e97b6dbe12..58e7abfc079 100644
--- a/proxy/http/HttpTransact.h
+++ b/proxy/http/HttpTransact.h
@@ -154,6 +154,7 @@ enum ViaString_t {
   VIA_ERROR_CACHE_READ        = 'R',
   VIA_ERROR_MOVED_TEMPORARILY = 'M',
   VIA_ERROR_LOOP_DETECTED     = 'L',
+  VIA_ERROR_UNKNOWN           = ' ',
   //
   // Now the detailed stuff
   //
diff --git a/proxy/http/HttpTransactHeaders.cc b/proxy/http/HttpTransactHeaders.cc
index f7550d61cab..0064a9f5e90 100644
--- a/proxy/http/HttpTransactHeaders.cc
+++ b/proxy/http/HttpTransactHeaders.cc
@@ -601,6 +601,10 @@ HttpTransactHeaders::generate_and_set_squid_codes(HTTPHdr *header, char *via_str
     log_code  = SQUID_LOG_ERR_LOOP_DETECTED;
     hier_code = SQUID_HIER_NONE;
     break;
+  case VIA_ERROR_UNKNOWN:
+    log_code  = SQUID_LOG_ERR_UNKNOWN;
+    hier_code = SQUID_HIER_NONE;
+    break;
   default:
     break;
   }