Explicitly spell out that "incorrect MAC" type errors can be caused by

data corruption in the network.

git-svn-id: svn://svn.tartarus.org/sgt/putty@7609 cda61777-01e9-0310-a592-d414129be87e

diff --git a/doc/errors.but b/doc/errors.but
index 0339245..2369b4c 100644 (file)
--- a/doc/errors.but
+++ b/doc/errors.but
@@ -209,6 +209,14 @@ encryption or decryption process. It's difficult to tell from this
 error message whether the problem is in the client, in the server,
 or in between.
 
 error message whether the problem is in the client, in the server,
 or in between.
 

+In particular, if the network is corrupting data at the TCP level, it
+may only be obvious with cryptographic protocols such as SSH, which
+explicitly check the integrity of the transferred data and complain
+loudly if the checks fail. Corruption of protocols without integrity
+protection (such as HTTP) will manifest in more subtle failures (such
+as misdisplayed text or images in a web browser) which may not be
+noticed.
+

 A known server problem which can cause this error is described in
 \k{faq-openssh-bad-openssl} in the FAQ.
 
 A known server problem which can cause this error is described in
 \k{faq-openssh-bad-openssl} in the FAQ.