--- loncom/lonnet/perl/lonnet.pm	2021/09/21 22:54:27	1.1465
+++ loncom/lonnet/perl/lonnet.pm	2021/09/22 13:52:02	1.1466
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1465 2021/09/21 22:54:27 raeburn Exp $
+# $Id: lonnet.pm,v 1.1466 2021/09/22 13:52:02 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -14387,10 +14387,15 @@ sub machine_ids {
 
 sub additional_machine_domains {
     my @domains;
-    open(my $fh,"<","$perlvar{'lonTabDir'}/expected_domains.tab");
-    while( my $line = <$fh>) {
-        $line =~ s/\s//g;
-        push(@domains,$line);
+    if (-e "$perlvar{'lonTabDir'}/expected_domains.tab") {
+        if (open(my $fh,"<","$perlvar{'lonTabDir'}/expected_domains.tab")) {
+            while (my $line = <$fh>) {
+                chomp($line);           
+                $line =~ s/\s//g;
+                push(@domains,$line);
+            }
+            close($fh);
+        }
     }
     return @domains;
 }