diff --git a/content/anrw/2023/attend.haml b/content/anrw/2023/attend.haml
index a4523f5..042cd8a 100644
--- a/content/anrw/2023/attend.haml
+++ b/content/anrw/2023/attend.haml
@@ -27,7 +27,7 @@ other: false
     IETF-117 for the full week, on a day pass for the day of the workshop,
     or as a full-time student.  The IETF registration fee is $150 for
     full-time students, which covers attendance at all IETF working groups,
-    %a{ :href => "/groups"}
+    %a{ :href => "/groups.html"}
       IRTF research groups,
     tutorials, and other sessions for the entire week, including the ANRW,
     so students are encouraged to attend for the entire week.
diff --git a/content/anrw/2023/travelgrants.haml b/content/anrw/2023/travelgrants.haml
index 9170bf9..f65cfca 100644
--- a/content/anrw/2023/travelgrants.haml
+++ b/content/anrw/2023/travelgrants.haml
@@ -13,7 +13,7 @@ other: false
   %em currently
   enrolled in Bachelor, Masters or PhD programs at any university. In
   addition,
-  %a{ :href => "/travelgrants"} IRTF Diversity Travel Grants 
+  %a{ :href => "/travelgrants.html"} IRTF Diversity Travel Grants 
   are also available to support attendance at the IETF-117 meeting,
   including the ANRW.
 
diff --git a/lib/filter_url.rb b/lib/filter_url.rb
index 7bb6d3d..1fd7ce0 100644
--- a/lib/filter_url.rb
+++ b/lib/filter_url.rb
@@ -47,7 +47,7 @@ class URLFilter < Nanoc::Filter
     "Sadjad Fouladi"           => "https://sadjad.org",
     "Nick Feamster"            => "https://people.cs.uchicago.edu/~feamster/",
     "Simone Ferlin"            => "https://ferlin.io",
-    "Georgia Fragkouli"        => "https://people.epfl.ch/georgia.fragkouli?lang=en",
+    "Georgia Fragkouli"        => "https://georgia-fragkouli.github.io",
     "Michio Honda"             => "https://micchie.net",
     "Oliver Gasser"            => "https://olivergasser.net",
     "Phillipa Gill"            => "https://people.cs.umass.edu/~phillipa/",
@@ -115,7 +115,7 @@ class URLFilter < Nanoc::Filter
     "BitTorrent" => "https://en.wikipedia.org/wiki/BitTorrent",
     "Boston University" => "https://www.bu.edu",
     "Brown University" => "https://www.brown.edu/",
-    "BT" => "http://www.btplc.com/innovation/",
+    "BT" => "http://www.btplc.com/",
     "CAIDA" => "https://www.caida.org/",
     "Carnegie Mellon University" => "https://www.cmu.edu",
     "Cisco" => "https://cisco.com/",
diff --git a/lib/helper_irtf.rb b/lib/helper_irtf.rb
index 227fd8c..2c9c12c 100644
--- a/lib/helper_irtf.rb
+++ b/lib/helper_irtf.rb
@@ -436,7 +436,7 @@ def contacts
 
   # SAMRG
   buford = Person.new("John", "Buford", "buford@samrg.org", "https://samrg.org/buford/index.html", nil)
-  schmidt = Person.new("Thomas", "Schmidt", "schmidt@informatik.haw-hamburg.de", "https://users.informatik.haw-hamburg.de/~schmidt/", nil)
+  schmidt = Person.new("Thomas", "Schmidt", "schmidt@informatik.haw-hamburg.de", "http://inet.haw-hamburg.de/members/schmidt", nil)
   samrg = RG.new(
     "samrg",
     "Scalable Adaptive Multicast",