However, this can incur a performance penalty. If PuTTY is running slowly with logging enabled, you could try unchecking this option. Be warned that the log file may not always be up to date as a result (although it will of course be flushed when it is closed, for instance at the end of a session).
4.2.4 Options specific to SSH packet logging
These options only apply if SSH packet data is being logged.
The following options allow particularly sensitive portions of unencrypted packets to be automatically left out of the log file. They are only intended to deter casual nosiness; an attacker could glean a lot of useful information from even these obfuscated logs (e.g., length of password).
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4.2.4.1 ‘Omit known password fields’
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4.2.4.2 ‘Omit session data’
4.2.4.1 ‘Omit known password fields’
When checked, decrypted password fields are removed from the log of transmitted packets. (This includes any user responses to challenge-response authentication methods such as ‘keyboard-interactive’.) This does not include X11 authentication data if using X11 forwarding.
Note that this will only omit data that PuTTY knows to be a password. However, if you start another login session within your PuTTY session, for instance, any password used will appear in the clear in the packet log. The next option may be of use to protect against this.
This option is enabled by default.
4.2.4.2 ‘Omit session data’
When checked, all decrypted ‘session data’ is omitted; this is defined as data in terminal sessions and in forwarded channels (TCP, X11, and authentication agent). This will usually substantially reduce the size of the resulting log file.
This option is disabled by default.
4.3 The Terminal panel
The Terminal configuration panel allows you to control the behaviour of PuTTY's terminal emulation.
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4.3.1 ‘Auto wrap mode initially on’
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4.3.2 ‘DEC Origin Mode initially on’
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4.3.3 ‘Implicit CR in every LF’
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4.3.4 ‘Implicit LF in every CR’
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4.3.5 ‘Use background colour to erase screen’
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4.3.6 ‘Enable blinking text’
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4.3.7 ‘Answerback to ^E’
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4.3.8 ‘Local echo’
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4.3.9 ‘Local line editing’
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4.3.10 Remote-controlled printing
4.3.1 ‘Auto wrap mode initially on’
Auto wrap mode controls what happens when text printed in a PuTTY window reaches the right-hand edge of the window.
With auto wrap mode on, if a long line of text reaches the right-hand edge, it will wrap over on to the next line so you can still see all the text. With auto wrap mode off, the cursor will stay at the right-hand edge of the screen, and all the characters in the line will be printed on top of each other.
If you are running a full-screen application and you occasionally find the screen scrolling up when it looks as if it shouldn't, you could try turning this option off.