diff --git a/.gitignore b/.gitignore
index 8710e975c1..c5026d15c8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,11 +48,14 @@ stamp-h1
 tap-driver.sh
 test-driver
 tests/common/test_common
+tests/libipm/test_libipm
+tests/libxrdp/test_libxrdp
 tests/memtest/memtest
+tests/xrdp/test_xrdp
 tools/devel/tcp_proxy/tcp_proxy
 *.trs
 xrdp/xrdp
 xrdp/xrdp.ini
 xrdp_configure_options.h
 xrdpapi/xrdp-xrdpapi-simple
-.vscode/*
\ No newline at end of file
+.vscode/*
diff --git a/common/guid.c b/common/guid.c
index 21611a478c..cf863648a5 100644
--- a/common/guid.c
+++ b/common/guid.c
@@ -65,8 +65,20 @@ guid_is_set(const struct guid *guid)
 
 }
 
-const char *guid_to_str(const struct guid *guid, char *str)
+const char *guid_to_str(const struct guid *src, char *dest)
 {
-    g_bytes_to_hexstr(guid->g, GUID_SIZE, str, GUID_STR_SIZE);
-    return str;
+    const unsigned char *guid = (const unsigned char *)src->g;
+
+    /*
+     * Flipping integers into little-endian
+     * See also: https://devblogs.microsoft.com/oldnewthing/20220928-00/?p=107221
+     */
+    g_sprintf(dest, "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
+              guid[3], guid[2], guid[1], guid[0],
+              guid[5], guid[4],
+              guid[7], guid[6],
+              guid[8], guid[9],
+              guid[10], guid[11], guid[12], guid[13], guid[14], guid[15]);
+
+    return dest;
 }
diff --git a/common/guid.h b/common/guid.h
index 546788c660..2951fa12d5 100644
--- a/common/guid.h
+++ b/common/guid.h
@@ -28,7 +28,8 @@
 #include "arch.h"
 
 #define GUID_SIZE 16  /* bytes */
-#define GUID_STR_SIZE (GUID_SIZE * 2 + 1)   /* Size for string representation */
+#define GUID_STR_SIZE (GUID_SIZE * 2 + 4 + 1)   /* w/ 4 hyphens + null terminator */
+
 
 /**
  * Use a struct for the guid so we can easily copy by assignment
@@ -66,10 +67,11 @@ guid_is_set(const struct guid *guid);
  * Converts a GUID to a string representation
  *
  * @param guid GUID to represent
- * @param str pointer to at least GUID_STR_SIZE bytes to store the
- *            representation
- * @return str is returned for convenience
+ * @param dest destionation pointer to at least GUID_STR_SIZE
+ *             bytes to store the representation
+ * @return dest is returned for convenience
  */
-const char *guid_to_str(const struct guid *guid, char *str);
+const char *guid_to_str(const struct guid *guid, char *dest);
 
 #endif
+
diff --git a/common/ms-rdpbcgr.h b/common/ms-rdpbcgr.h
index 6129f98fa3..4e5a5e4a2f 100644
--- a/common/ms-rdpbcgr.h
+++ b/common/ms-rdpbcgr.h
@@ -372,11 +372,11 @@
 
 /* Bitmap Codec: codecGUID (2.2.7.2.10.1.1) */
 
-/* CODEC_GUID_NSCODEC  CA8D1BB9-000F-154F-589FAE2D1A87E2D6 */
+/* CODEC_GUID_NSCODEC  CA8D1BB9-000F-154F-589F-AE2D1A87E2D6 */
 #define XR_CODEC_GUID_NSCODEC \
     "\xb9\x1b\x8d\xca\x0f\x00\x4f\x15\x58\x9f\xae\x2d\x1a\x87\xe2\xd6"
 
-/* CODEC_GUID_REMOTEFX 76772F12-BD72-4463-AFB3B73C9C6F7886 */
+/* CODEC_GUID_REMOTEFX 76772F12-BD72-4463-AFB3-B73C9C6F7886 */
 #define XR_CODEC_GUID_REMOTEFX \
     "\x12\x2F\x77\x76\x72\xBD\x63\x44\xAF\xB3\xB7\x3C\x9C\x6F\x78\x86"
 
@@ -384,18 +384,22 @@
 #define XR_CODEC_GUID_IMAGE_REMOTEFX \
     "\xD4\xCC\x44\x27\x8A\x9D\x74\x4E\x80\x3C\x0E\xCB\xEE\xA1\x9C\x54"
 
-/* MFVideoFormat_H264  0x34363248-0000-0010-800000AA00389B71 */
+/* MFVideoFormat_H264  34363248-0000-0010-8000-00AA00389B71 */
 #define XR_CODEC_GUID_H264 \
     "\x48\x32\x36\x34\x00\x00\x10\x00\x80\x00\x00\xAA\x00\x38\x9B\x71"
 
-/* CODEC_GUID_JPEG     1BAF4CE6-9EED-430C-869ACB8B37B66237 */
+/* CODEC_GUID_JPEG     1BAF4CE6-9EED-430C-869A-CB8B37B66237 */
 #define XR_CODEC_GUID_JPEG \
     "\xE6\x4C\xAF\x1B\xED\x9E\x0C\x43\x86\x9A\xCB\x8B\x37\xB6\x62\x37"
 
-/* CODEC_GUID_PNG      0E0C858D-28E0-45DB-ADAA0F83E57CC560 */
+/* CODEC_GUID_PNG      0E0C858D-28E0-45DB-ADAA-0F83E57CC560 */
 #define XR_CODEC_GUID_PNG \
     "\x8D\x85\x0C\x0E\xE0\x28\xDB\x45\xAD\xAA\x0F\x83\xE5\x7C\xC5\x60"
 
+/* CODEC_GUID_IGNORE   0C4351A6-3535-42AE-910C-CDFCE5760B58 */
+#define XR_CODEC_GUID_IGNORE \
+    "\xA6\x51\x43\x0C\x35\x35\xAE\x42\x91\x0C\xCD\xFC\xE5\x76\x0B\x58"
+
 /* PDU Types (2.2.8.1.1.1.1) */
 #define PDUTYPE_DEMANDACTIVEPDU        0x1
 #define PDUTYPE_CONFIRMACTIVEPDU       0x3
diff --git a/libxrdp/xrdp_caps.c b/libxrdp/xrdp_caps.c
index c953205342..2f3d8e756b 100644
--- a/libxrdp/xrdp_caps.c
+++ b/libxrdp/xrdp_caps.c
@@ -25,6 +25,7 @@
 
 #include <limits.h>
 
+#include "guid.h"
 #include "libxrdp.h"
 #include "ms-rdpbcgr.h"
 #include "ms-rdperp.h"
@@ -521,6 +522,10 @@ xrdp_caps_process_codecs(struct xrdp_rdp *self, struct stream *s, int len)
     int i1;
     char *codec_guid;
     char *next_guid;
+    struct guid guid;
+    char codec_guid_str[GUID_STR_SIZE];
+
+    guid_clear(&guid);
 
     if (len < 1)
     {
@@ -533,6 +538,10 @@ xrdp_caps_process_codecs(struct xrdp_rdp *self, struct stream *s, int len)
     for (index = 0; index < codec_count; index++)
     {
         codec_guid = s->p;
+
+        g_memcpy(guid.g, s->p, GUID_SIZE);
+        guid_to_str(&guid, codec_guid_str);
+
         if (len < 16 + 1 + 2)
         {
             LOG(LOG_LEVEL_ERROR, "xrdp_caps_process_codecs: error");
@@ -552,8 +561,8 @@ xrdp_caps_process_codecs(struct xrdp_rdp *self, struct stream *s, int len)
 
         if (g_memcmp(codec_guid, XR_CODEC_GUID_NSCODEC, 16) == 0)
         {
-            LOG(LOG_LEVEL_INFO, "xrdp_caps_process_codecs: nscodec, codec id %d, properties len %d",
-                codec_id, codec_properties_length);
+            LOG(LOG_LEVEL_INFO, "xrdp_caps_process_codecs: NSCodec(%s), codec id [%d], properties len [%d]",
+                codec_guid_str, codec_id, codec_properties_length);
             self->client_info.ns_codec_id = codec_id;
             i1 = MIN(64, codec_properties_length);
             g_memcpy(self->client_info.ns_prop, s->p, i1);
@@ -561,8 +570,8 @@ xrdp_caps_process_codecs(struct xrdp_rdp *self, struct stream *s, int len)
         }
         else if (g_memcmp(codec_guid, XR_CODEC_GUID_REMOTEFX, 16) == 0)
         {
-            LOG(LOG_LEVEL_INFO, "xrdp_caps_process_codecs: RemoteFX, codec id %d, properties len %d",
-                codec_id, codec_properties_length);
+            LOG(LOG_LEVEL_INFO, "xrdp_caps_process_codecs: RemoteFX(%s), codec id [%d], properties len [%d]",
+                codec_guid_str, codec_id, codec_properties_length);
             self->client_info.rfx_codec_id = codec_id;
             i1 = MIN(64, codec_properties_length);
             g_memcpy(self->client_info.rfx_prop, s->p, i1);
@@ -570,8 +579,8 @@ xrdp_caps_process_codecs(struct xrdp_rdp *self, struct stream *s, int len)
         }
         else if (g_memcmp(codec_guid, XR_CODEC_GUID_JPEG, 16) == 0)
         {
-            LOG(LOG_LEVEL_INFO, "xrdp_caps_process_codecs: jpeg, codec id %d, properties len %d",
-                codec_id, codec_properties_length);
+            LOG(LOG_LEVEL_INFO, "xrdp_caps_process_codecs: JPEG(%s), codec id [%d], properties len [%d]",
+                codec_guid_str, codec_id, codec_properties_length);
             self->client_info.jpeg_codec_id = codec_id;
             i1 = MIN(64, codec_properties_length);
             g_memcpy(self->client_info.jpeg_prop, s->p, i1);
@@ -587,8 +596,8 @@ xrdp_caps_process_codecs(struct xrdp_rdp *self, struct stream *s, int len)
         }
         else if (g_memcmp(codec_guid, XR_CODEC_GUID_H264, 16) == 0)
         {
-            LOG(LOG_LEVEL_INFO, "xrdp_caps_process_codecs: h264, codec id %d, properties len %d",
-                codec_id, codec_properties_length);
+            LOG(LOG_LEVEL_INFO, "xrdp_caps_process_codecs: H264(%s), codec id [%d], properties len [%d]",
+                codec_guid_str, codec_id, codec_properties_length);
             self->client_info.h264_codec_id = codec_id;
             i1 = MIN(64, codec_properties_length);
             g_memcpy(self->client_info.h264_prop, s->p, i1);
@@ -596,7 +605,8 @@ xrdp_caps_process_codecs(struct xrdp_rdp *self, struct stream *s, int len)
         }
         else
         {
-            LOG(LOG_LEVEL_WARNING, "xrdp_caps_process_codecs: unknown codec id %d", codec_id);
+            LOG(LOG_LEVEL_WARNING, "xrdp_caps_process_codecs: unknown(%s), codec id [%d], properties len [%d]",
+                codec_guid_str, codec_id, codec_properties_length);
         }
 
         s->p = next_guid;
diff --git a/tests/common/Makefile.am b/tests/common/Makefile.am
index e6686e3124..f7dbbe28f6 100644
--- a/tests/common/Makefile.am
+++ b/tests/common/Makefile.am
@@ -17,7 +17,8 @@ test_common_SOURCES = \
     test_string_calls.c \
     test_os_calls.c \
     test_ssl_calls.c \
-    test_base64.c
+    test_base64.c \
+    test_guid.c
 
 test_common_CFLAGS = \
     @CHECK_CFLAGS@ \
diff --git a/tests/common/test_common.h b/tests/common/test_common.h
index ed422ab419..1878bafb72 100644
--- a/tests/common/test_common.h
+++ b/tests/common/test_common.h
@@ -11,5 +11,6 @@ Suite *make_suite_test_string(void);
 Suite *make_suite_test_os_calls(void);
 Suite *make_suite_test_ssl_calls(void);
 Suite *make_suite_test_base64(void);
+Suite *make_suite_test_guid(void);
 
 #endif /* TEST_COMMON_H */
diff --git a/tests/common/test_common_main.c b/tests/common/test_common_main.c
index a08bc7f762..37adaa3fea 100644
--- a/tests/common/test_common_main.c
+++ b/tests/common/test_common_main.c
@@ -49,6 +49,7 @@ int main (void)
     srunner_add_suite(sr, make_suite_test_os_calls());
     srunner_add_suite(sr, make_suite_test_ssl_calls());
     srunner_add_suite(sr, make_suite_test_base64());
+    srunner_add_suite(sr, make_suite_test_guid());
     //   srunner_add_suite(sr, make_list_suite());
 
     srunner_set_tap(sr, "-");
diff --git a/tests/common/test_guid.c b/tests/common/test_guid.c
new file mode 100644
index 0000000000..7580bb9543
--- /dev/null
+++ b/tests/common/test_guid.c
@@ -0,0 +1,77 @@
+
+#if defined(HAVE_CONFIG_H)
+#include "config_ac.h"
+#endif
+
+#include "guid.h"
+#include "ms-rdpbcgr.h"
+#include "os_calls.h"
+
+#include "test_common.h"
+
+/******************************************************************************/
+
+START_TEST(test_guid_to_str_remotefx)
+{
+    /* setup */
+    char dest[GUID_STR_SIZE];
+    struct guid guid;
+    g_memcpy(guid.g, XR_CODEC_GUID_REMOTEFX, GUID_SIZE);
+
+    /* test */
+    guid_to_str(&guid, dest);
+
+    /* verify */
+    ck_assert_str_eq(dest, "76772F12-BD72-4463-AFB3-B73C9C6F7886");
+}
+END_TEST
+
+START_TEST(test_guid_to_str_nscodec)
+{
+
+    /* setup */
+    char dest[GUID_STR_SIZE];
+    struct guid guid;
+    g_memcpy(guid.g, XR_CODEC_GUID_NSCODEC, GUID_SIZE);
+
+    /* test */
+    guid_to_str(&guid, dest);
+
+    /* verify */
+    ck_assert_str_eq(dest, "CA8D1BB9-000F-154F-589F-AE2D1A87E2D6");
+}
+END_TEST
+
+START_TEST(test_guid_to_str_ignore)
+{
+    /* setup */
+    char dest[GUID_STR_SIZE];
+    struct guid guid;
+    g_memcpy(guid.g, XR_CODEC_GUID_IGNORE, GUID_SIZE);
+
+    /* test */
+    guid_to_str(&guid, dest);
+
+    /* verify */
+    ck_assert_str_eq(dest, "0C4351A6-3535-42AE-910C-CDFCE5760B58");
+}
+END_TEST
+
+/******************************************************************************/
+
+Suite *
+make_suite_test_guid(void)
+{
+    Suite *s;
+    TCase *tc_guid;
+
+    s = suite_create("GUID");
+
+    tc_guid = tcase_create("guid_to_str");
+    suite_add_tcase(s, tc_guid);
+    tcase_add_test(tc_guid, test_guid_to_str_remotefx);
+    tcase_add_test(tc_guid, test_guid_to_str_nscodec);
+    tcase_add_test(tc_guid, test_guid_to_str_ignore);
+
+    return s;
+}
diff --git a/tests/common/test_string_calls.c b/tests/common/test_string_calls.c
index 6dc14a7349..0f7d626859 100644
--- a/tests/common/test_string_calls.c
+++ b/tests/common/test_string_calls.c
@@ -4,6 +4,7 @@
 #endif
 
 #include "string_calls.h"
+#include "ms-rdpbcgr.h"
 
 #include "test_common.h"