diff --git a/tests/data/test1008 b/tests/data/test1008
index 30714f9af3..7635a12aaa 100644
--- a/tests/data/test1008
+++ b/tests/data/test1008
@@ -85,6 +85,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy CONNECT auth NTLM with chunked-encoded 407 response
diff --git a/tests/data/test1021 b/tests/data/test1021
index 81127249a1..7c3efec84b 100644
--- a/tests/data/test1021
+++ b/tests/data/test1021
@@ -91,6 +91,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy CONNECT with any proxyauth and proxy offers NTLM and close
diff --git a/tests/data/test1097 b/tests/data/test1097
index b899810d09..3b733a55a9 100644
--- a/tests/data/test1097
+++ b/tests/data/test1097
@@ -47,6 +47,7 @@ https
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP POST using CONNECT with --proxy-ntlm but no auth is required
diff --git a/tests/data/test1100 b/tests/data/test1100
index e38c0e0d73..ae694514e9 100644
--- a/tests/data/test1100
+++ b/tests/data/test1100
@@ -63,6 +63,7 @@ This is the final page !
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test1215 b/tests/data/test1215
index ea62eeb607..6c27f8082e 100644
--- a/tests/data/test1215
+++ b/tests/data/test1215
@@ -58,6 +58,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test150 b/tests/data/test150
index cdd4cf6737..44d2052d54 100644
--- a/tests/data/test150
+++ b/tests/data/test150
@@ -50,6 +50,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test155 b/tests/data/test155
index 70ac7fd2f0..c4fe9ea12e 100644
--- a/tests/data/test155
+++ b/tests/data/test155
@@ -75,6 +75,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test159 b/tests/data/test159
index 1f8a2f8877..c0cbe06afd 100644
--- a/tests/data/test159
+++ b/tests/data/test159
@@ -56,6 +56,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test162 b/tests/data/test162
index 9b75f7c6b2..828c2a5e6c 100644
--- a/tests/data/test162
+++ b/tests/data/test162
@@ -27,6 +27,7 @@ isn't because there's no Proxy-Authorization: NTLM header
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test169 b/tests/data/test169
index f7419e6d03..22930a1420 100644
--- a/tests/data/test169
+++ b/tests/data/test169
@@ -77,6 +77,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP with proxy-requiring-NTLM to site-requiring-Digest
diff --git a/tests/data/test170 b/tests/data/test170
index a2c221792c..f0e596b790 100644
--- a/tests/data/test170
+++ b/tests/data/test170
@@ -19,6 +19,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP POST with --proxy-ntlm and no SSL with no response
diff --git a/tests/data/test176 b/tests/data/test176
index 413c149255..ed0c946e89 100644
--- a/tests/data/test176
+++ b/tests/data/test176
@@ -47,6 +47,7 @@ content for you
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test2025 b/tests/data/test2025
index 4c8df18ad3..03b6b14172 100644
--- a/tests/data/test2025
+++ b/tests/data/test2025
@@ -195,6 +195,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test2028 b/tests/data/test2028
index 793ad3e360..2a03836b3b 100644
--- a/tests/data/test2028
+++ b/tests/data/test2028
@@ -231,6 +231,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test2029 b/tests/data/test2029
index 7b8a5e2c79..7c697e3d49 100644
--- a/tests/data/test2029
+++ b/tests/data/test2029
@@ -168,6 +168,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test2030 b/tests/data/test2030
index 8de81d0949..a80c15ece3 100644
--- a/tests/data/test2030
+++ b/tests/data/test2030
@@ -220,6 +220,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test2031 b/tests/data/test2031
index 19f75335ca..0df841b778 100644
--- a/tests/data/test2031
+++ b/tests/data/test2031
@@ -234,6 +234,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test2032 b/tests/data/test2032
index 128deab95f..30b7f72a53 100644
--- a/tests/data/test2032
+++ b/tests/data/test2032
@@ -90,6 +90,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test2033 b/tests/data/test2033
index fd097e6f76..df9ac357e3 100644
--- a/tests/data/test2033
+++ b/tests/data/test2033
@@ -91,6 +91,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test209 b/tests/data/test209
index d8bd8bd242..96dd60ce9f 100644
--- a/tests/data/test209
+++ b/tests/data/test209
@@ -75,6 +75,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy CONNECT auth NTLM
diff --git a/tests/data/test213 b/tests/data/test213
index 5c14aa8756..3e9f678859 100644
--- a/tests/data/test213
+++ b/tests/data/test213
@@ -75,6 +75,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP 1.0 proxy CONNECT auth NTLM and then POST
diff --git a/tests/data/test239 b/tests/data/test239
index 2748100fb4..af65e3150f 100644
--- a/tests/data/test239
+++ b/tests/data/test239
@@ -52,6 +52,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy-auth NTLM and then POST
diff --git a/tests/data/test243 b/tests/data/test243
index d53a437981..c96ab7cad7 100644
--- a/tests/data/test243
+++ b/tests/data/test243
@@ -73,6 +73,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP POST with --proxy-anyauth, picking NTLM
diff --git a/tests/data/test265 b/tests/data/test265
index 07de455471..255fd48086 100644
--- a/tests/data/test265
+++ b/tests/data/test265
@@ -78,6 +78,7 @@ http
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy CONNECT auth NTLM and then POST, response-body in the 407
diff --git a/tests/data/test267 b/tests/data/test267
index 479031c461..c58b82dcaf 100644
--- a/tests/data/test267
+++ b/tests/data/test267
@@ -56,6 +56,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test547 b/tests/data/test547
index 7bcf5a4d43..95e3638b95 100644
--- a/tests/data/test547
+++ b/tests/data/test547
@@ -76,6 +76,7 @@ lib547
 </tool>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy auth NTLM with POST data from read callback
diff --git a/tests/data/test548 b/tests/data/test548
index a6e2a9bf2a..888908aa2c 100644
--- a/tests/data/test548
+++ b/tests/data/test548
@@ -76,6 +76,7 @@ lib548
 </tool>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy auth NTLM with POST data from CURLOPT_POSTFIELDS
diff --git a/tests/data/test555 b/tests/data/test555
index bf06b524d4..a6635d49a1 100644
--- a/tests/data/test555
+++ b/tests/data/test555
@@ -81,6 +81,7 @@ lib555
 </tool>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy auth NTLM with POST data from read callback multi-if
diff --git a/tests/data/test590 b/tests/data/test590
index f50664d8f2..171ec0d201 100644
--- a/tests/data/test590
+++ b/tests/data/test590
@@ -74,6 +74,7 @@ lib590
 </tool>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 HTTP proxy offers Negotiate+NTLM, use only NTLM
diff --git a/tests/data/test67 b/tests/data/test67
index bfe6edd26e..709ce7d1f2 100644
--- a/tests/data/test67
+++ b/tests/data/test67
@@ -56,6 +56,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test68 b/tests/data/test68
index 10b4429c33..6460f5d5f3 100644
--- a/tests/data/test68
+++ b/tests/data/test68
@@ -55,6 +55,7 @@ Wrong password dude. Get it fixed and return.
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test69 b/tests/data/test69
index 441aed7e8b..85ab657be1 100644
--- a/tests/data/test69
+++ b/tests/data/test69
@@ -72,6 +72,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test81 b/tests/data/test81
index 0da0bdca08..a3f738134a 100644
--- a/tests/data/test81
+++ b/tests/data/test81
@@ -55,6 +55,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test822 b/tests/data/test822
index 6451b841ae..4d6214824a 100644
--- a/tests/data/test822
+++ b/tests/data/test822
@@ -34,6 +34,7 @@ imap
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 IMAP NTLM authentication
diff --git a/tests/data/test827 b/tests/data/test827
index 2171363e49..a59ae17752 100644
--- a/tests/data/test827
+++ b/tests/data/test827
@@ -34,6 +34,7 @@ imap
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 IMAP NTLM authentication with initial response
diff --git a/tests/data/test831 b/tests/data/test831
index ae93cc5810..72aee1274a 100644
--- a/tests/data/test831
+++ b/tests/data/test831
@@ -26,6 +26,7 @@ imap
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 IMAP NTLM graceful cancellation
diff --git a/tests/data/test834 b/tests/data/test834
index f90c3b4910..71dcc0b929 100644
--- a/tests/data/test834
+++ b/tests/data/test834
@@ -36,6 +36,7 @@ imap
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 IMAP NTLM authentication with SASL downgrade
diff --git a/tests/data/test868 b/tests/data/test868
index 0e495e9581..8568bc6c7a 100644
--- a/tests/data/test868
+++ b/tests/data/test868
@@ -36,6 +36,7 @@ pop3
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 POP3 NTLM authentication
diff --git a/tests/data/test873 b/tests/data/test873
index 8cdb0899a1..167669a426 100644
--- a/tests/data/test873
+++ b/tests/data/test873
@@ -35,6 +35,7 @@ pop3
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 POP3 NTLM authentication with initial response
diff --git a/tests/data/test877 b/tests/data/test877
index b17a3eec41..cd20b6fd70 100644
--- a/tests/data/test877
+++ b/tests/data/test877
@@ -27,6 +27,7 @@ pop3
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 POP3 NTLM graceful cancellation
diff --git a/tests/data/test880 b/tests/data/test880
index 9857bad947..27036465fb 100644
--- a/tests/data/test880
+++ b/tests/data/test880
@@ -38,6 +38,7 @@ pop3
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 POP3 NTLM authentication with SASL downgrade
diff --git a/tests/data/test89 b/tests/data/test89
index f348eb6581..4b0c4ae4bb 100644
--- a/tests/data/test89
+++ b/tests/data/test89
@@ -89,6 +89,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test90 b/tests/data/test90
index 24a7ff4d25..e311ada75e 100644
--- a/tests/data/test90
+++ b/tests/data/test90
@@ -127,6 +127,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test906 b/tests/data/test906
index 9e85dc52ad..8e07114284 100644
--- a/tests/data/test906
+++ b/tests/data/test906
@@ -26,6 +26,7 @@ smtp
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 SMTP NTLM authentication
diff --git a/tests/data/test91 b/tests/data/test91
index e6f34aedf0..90110ff9dd 100644
--- a/tests/data/test91
+++ b/tests/data/test91
@@ -73,6 +73,7 @@ Finally, this is the real page!
 <client>
 <features>
 NTLM
+!SSPI
 </features>
 <server>
 http
diff --git a/tests/data/test921 b/tests/data/test921
index ffcecd9cff..eb1246001f 100644
--- a/tests/data/test921
+++ b/tests/data/test921
@@ -25,6 +25,7 @@ smtp
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 SMTP NTLM authentication with initial response
diff --git a/tests/data/test933 b/tests/data/test933
index 1b06aedad9..e52c8f90fb 100644
--- a/tests/data/test933
+++ b/tests/data/test933
@@ -26,6 +26,7 @@ smtp
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 SMTP NTLM graceful cancellation
diff --git a/tests/data/test936 b/tests/data/test936
index 19bbd0e895..cbc6fb96d2 100644
--- a/tests/data/test936
+++ b/tests/data/test936
@@ -28,6 +28,7 @@ smtp
 </server>
 <features>
 NTLM
+!SSPI
 </features>
  <name>
 SMTP NTLM authentication with SASL downgrade