diff --git a/crypto/bn/asm/armv4-gf2m.pl b/crypto/bn/asm/armv4-gf2m.pl
index 7375e3970a..3332eb112a 100644
--- a/crypto/bn/asm/armv4-gf2m.pl
+++ b/crypto/bn/asm/armv4-gf2m.pl
@@ -37,7 +37,7 @@
 # Câmara, D.; Gouvêa, C. P. L.; López, J. & Dahab, R.: Fast Software
 # Polynomial Multiplication on ARM Processors using the NEON Engine.
 #
-# http://conradoplg.cryptoland.net/files/2010/12/mocrysen13.pdf
+# https://conradoplg.modp.net/files/2010/12/mocrysen13.pdf
 
 # $output is the last argument if it looks like a file (it has an extension)
 # $flavour is the first argument if it doesn't look like a file
diff --git a/crypto/bn/bn_mont.c b/crypto/bn/bn_mont.c
index a338dbfd63..0bdfce3c48 100644
--- a/crypto/bn/bn_mont.c
+++ b/crypto/bn/bn_mont.c
@@ -8,10 +8,9 @@
  */
 
 /*
- * Details about Montgomery multiplication algorithms can be found at
- * http://security.ece.orst.edu/publications.html, e.g.
- * http://security.ece.orst.edu/koc/papers/j37acmon.pdf and
- * sections 3.8 and 4.2 in http://security.ece.orst.edu/koc/papers/r01rsasw.pdf
+ * Details about Montgomery multiplication algorithms can be found in
+ * https://www.microsoft.com/en-us/research/wp-content/uploads/1996/01/j37acmon.pdf
+ * and https://cetinkayakoc.net/docs/r01.pdf
  */
 
 #include "internal/cryptlib.h"
diff --git a/crypto/modes/asm/ghash-armv4.pl b/crypto/modes/asm/ghash-armv4.pl
index f5618168bc..5a0a406ee3 100644
--- a/crypto/modes/asm/ghash-armv4.pl
+++ b/crypto/modes/asm/ghash-armv4.pl
@@ -55,7 +55,7 @@
 # Câmara, D.; Gouvêa, C. P. L.; López, J. & Dahab, R.: Fast Software
 # Polynomial Multiplication on ARM Processors using the NEON Engine.
 #
-# http://conradoplg.cryptoland.net/files/2010/12/mocrysen13.pdf
+# https://conradoplg.modp.net/files/2010/12/mocrysen13.pdf
 
 # ====================================================================
 # Note about "528B" variant. In ARM case it makes lesser sense to
diff --git a/crypto/perlasm/x86_64-xlate.pl b/crypto/perlasm/x86_64-xlate.pl
index 6ee56b874b..cd8d35ea67 100755
--- a/crypto/perlasm/x86_64-xlate.pl
+++ b/crypto/perlasm/x86_64-xlate.pl
@@ -664,8 +664,7 @@ my %globals;
 	);
 
     # Following constants are defined in x86_64 ABI supplement, for
-    # example available at https://www.uclibc.org/docs/psABI-x86_64.pdf,
-    # see section 3.7 "Stack Unwind Algorithm".
+    # example available at https://gitlab.com/x86-psABIs/x86-64-ABI.
     my %DW_reg_idx = (
 	"%rax"=>0,  "%rdx"=>1,  "%rcx"=>2,  "%rbx"=>3,
 	"%rsi"=>4,  "%rdi"=>5,  "%rbp"=>6,  "%rsp"=>7,
diff --git a/doc/man3/ADMISSIONS.pod b/doc/man3/ADMISSIONS.pod
index f86aac922a..d4db385d9b 100644
--- a/doc/man3/ADMISSIONS.pod
+++ b/doc/man3/ADMISSIONS.pod
@@ -98,7 +98,7 @@ PROFESSION_INFO_set0_registrationNumber
 The B<PROFESSION_INFOS>, B<ADMISSION_SYNTAX>, B<ADMISSIONS>, and
 B<PROFESSION_INFO> types are opaque structures representing the
 analogous types defined in the Common PKI Specification published
-by L<https://www.t7ev.org>.
+by L<T7 & TELETRUST|https://www.bundesnetzagentur.de/EVD/DE/SharedDocuments/Downloads/Anbieter_Infothek/Common_PKI_v2.0_02.pdf?__blob=publicationFile&v=1>.
 Knowledge of those structures and their semantics is assumed.
 
 The conventional routines to convert between DER and the local format
diff --git a/external/perl/Text-Template-1.56/lib/Text/Template.pm b/external/perl/Text-Template-1.56/lib/Text/Template.pm
index be38c73ce4..dec5b61419 100644
--- a/external/perl/Text-Template-1.56/lib/Text/Template.pm
+++ b/external/perl/Text-Template-1.56/lib/Text/Template.pm
@@ -2337,8 +2337,8 @@ There are not quite enough tests in the test suite.
 
 =head1 SOURCE
 
-The development version is on github at L<https://https://github.com/mschout/perl-text-template>
-and may be cloned from L<git://https://github.com/mschout/perl-text-template.git>
+The development version is on github at L<https://github.com/mschout/perl-text-template>
+and may be cloned from L<https://github.com/mschout/perl-text-template.git>
 
 =head1 BUGS
 
diff --git a/external/perl/Text-Template-1.56/lib/Text/Template/Preprocess.pm b/external/perl/Text-Template-1.56/lib/Text/Template/Preprocess.pm
index 4fea67b383..b4f7d53eba 100644
--- a/external/perl/Text-Template-1.56/lib/Text/Template/Preprocess.pm
+++ b/external/perl/Text-Template-1.56/lib/Text/Template/Preprocess.pm
@@ -122,8 +122,8 @@ L<Text::Template>
 
 =head1 SOURCE
 
-The development version is on github at L<https://https://github.com/mschout/perl-text-template>
-and may be cloned from L<git://https://github.com/mschout/perl-text-template.git>
+The development version is on github at L<https://github.com/mschout/perl-text-template>
+and may be cloned from L<https://github.com/mschout/perl-text-template.git>
 
 =head1 BUGS