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diff --git a/doc/errors.but b/doc/errors.but
index 5a0d83dc..bf9672d0 100644
--- a/doc/errors.but
+++ b/doc/errors.but
@@ -1,5 +1,3 @@
-\define{versioniderrors} \versionid $Id$
-
 \C{errors} Common \i{error messages}
 
 This chapter lists a number of common error messages which PuTTY and
@@ -58,17 +56,6 @@ in the same way as you would if it was new.
 
 See \k{gs-hostkey} for more information on host keys.
 
-\H{errors-portfwd-space} \q{Out of space for port forwardings}
-
-PuTTY has a fixed-size buffer which it uses to store the details of
-all \i{port forwardings} you have set up in an SSH session. If you
-specify too many port forwardings on the PuTTY or Plink command line
-and this buffer becomes full, you will see this error message.
-
-We need to fix this (fixed-size buffers are almost always a mistake)
-but we haven't got round to it. If you actually have trouble with
-this, let us know and we'll move it up our priority list.
-
 \H{errors-cipher-warning} \q{The first cipher supported by the server is
 ... below the configured warning threshold}
 
@@ -182,6 +169,9 @@ user's home directory on the server. Also, read the PuTTY Event Log;
 the server may have sent diagnostic messages explaining exactly what
 problem it had with your setup.
 
+\K{pubkey-gettingready} has some hints on server-side public key
+setup.
+
 \H{errors-access-denied} \q{Access denied}, \q{Authentication refused}
 
 Various forms of this error are printed in the PuTTY window, or
@@ -235,9 +225,10 @@ gone wrong in the 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.
 
-If you get this error, one thing you could try would be to fiddle
-with the setting of \q{Miscomputes SSH-2 encryption keys} on the Bugs
-panel (see \k{config-ssh-bug-derivekey2}).
+If you get this error, one thing you could try would be to fiddle with
+the setting of \q{Miscomputes SSH-2 encryption keys} (see
+\k{config-ssh-bug-derivekey2}) or \q{Ignores SSH-2 maximum packet
+size} (see \k{config-ssh-bug-maxpkt2}) on the Bugs panel .
 
 Another known server problem which can cause this error is described
 in \k{faq-openssh-bad-openssl} in the FAQ.
@@ -347,3 +338,13 @@ things into PuTTY while the network is down, but it can also occur
 if PuTTY decides of its own accord to send data: due to a repeat key
 exchange in SSH-2 (see \k{config-ssh-kex-rekey}) or due to
 keepalives (\k{config-keepalive}).
+
+\H{errors-cannotassignaddress} \q{Network error: Cannot assign requested
+address}
+
+This means that the operating system rejected the parameters of the
+network connection PuTTY tried to make, usually without actually
+trying to connect to anything, because they were simply invalid.
+
+A common way to provoke this error is to accidentally try to connect
+to port 0, which is not a valid port number.