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# Topic review

martin

## Re: bad message (badly formatted packet or protocol incompatibility). error code 5

Please attach a full session log file showing the problem (using the latest version of WinSCP).

To generate the session log file, use /log=C:\path\to\winscp.log command-line argument. Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.
navidnr

## bad message (badly formatted packet or protocol incompatibility). error code 5

Hello
I am currently using winscp 5.15.
I wrote a batch file which was working well since last week.
And now it sends me this massage : "bad message (badly formatted packet or protocol incompatibility). error code 5"
winscp.com
option batch abort
option confirm off
open sftp://administrator:###@172.17.18.56/ -hostkey="ssh-ed25519 256 ###"
mkdir /C:/TESTSRV/%TIMESTAMP#yyyy-mm-dd%
after mkdir I got the above error.
I will be glad if you can help me as soon as possible.