I add Windows 7 slave by launch method "launch slave agents via SSH" in Jenkins, my system info is:
MINGW32_NT-6.1 WIN7VM06 1.0.17(0.48/3/2) 2011-04-24 23:39 i686 Msys

and I got the following error:
[03/02/17 16:35:13] [SSH] Opening SSH connection to WIN7VM06:22.
[03/02/17 16:35:14] [SSH] Authentication successful.
[03/02/17 16:35:18] [SSH] The remote users environment is:
ALLUSERSPROFILE='C:\ProgramData'
ANT_HOME='C:\apache-ant-1.9.3'
APPDATA='C:\Users\chunhui.li\AppData\Roaming'
BASH=/usr/bin/bash
BASH_ARGC=()
BASH_ARGV=()
BASH_EXECUTION_STRING=set
BASH_LINENO=()
BASH_SOURCE=()
BASH_VERSINFO=([0]="3" [1]="1" [2]="17" [3]="1" [4]="release" [5]="i686-pc-msys")
BASH_VERSION='3.1.17(1)-release'
BITVISESFSDLL=00001988-43C8DDE8-B5059B29-598EC7DD
BZR_PROGRESS_BAR=none
BZR_REMOTE_PATH=/data/cmsadmin/environment/release/MScms/Environment_latest/bzr
COMMONPROGRAMFILES='C:\Program Files (x86)\Common Files'
COMMONPROGRAMFILES(X86)='C:\Program Files (x86)\Common Files'
COMMONPROGRAMW6432='C:\Program Files\Common Files'
COMPUTERNAME=WIN7VM06
COMSPEC='C:\Windows\system32\cmd.exe'
CVConfigPath=/data/cmsadmin/environment/cmsadmin/CVconfig
CV_HOSTTYPE=i686_MINGW32_1.0.17
DIRSTACK=()
EUID=500
FP_NO_HOST_CHECK=NO
GROUPS=()
HISTCONTROL=ignoredups:ignorespace
HISTFILE=/data/users/chunhui.li/.bash_history
HISTFILESIZE=2000
HISTSIZE=1000
HOME=/data/users/chunhui.li
HOMEDRIVE='
'
HOMEPATH='USERSERVER\homes'
HOMESHARE='\\USERSERVER\homes'
HOSTNAME=WIN7VM06
HOSTTYPE=i686_MINGW32_1.0.17
IFS=$' \t\n'
JAVA_HOME='C:\Program Files\Java\jdk1.7.0_79'
LOCALAPPDATA='C:\Users\chunhui.li\AppData\Local'
LOGNAME=chunhui.li
LOGONSERVER='
FILESERVER'
LS_COLORS='no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:tw=30;42:ow=34;42:st=37;44:ex=01;32:.cmd=01;32:.exe=01;32:.com=01;32:.btm=01;32:.bat=01;32:.tar=01;31:.tgz=01;31:.arj=01;31:.taz=01;31:.lzh=01;31:.zip=01;31:.z=01;31:.Z=01;31:.gz=01;31:.bz2=01;31:.deb=01;31:.rpm=01;31:.jar=01;31:.jpg=01;35:.jpeg=01;35:.gif=01;35:.bmp=01;35:.pbm=01;35:.pgm=01;35:.ppm=01;35:.tga=01;35:.xbm=01;35:.xpm=01;35:.tif=01;35:.tiff=01;35:.png=01;35:.mov=01;35:.mpg=01;35:.mpeg=01;35:.avi=01;35:.fli=01;35:.gl=01;35:.dl=01;35:.xcf=01;35:.xwd=01;35:.flac=01;35:.mp3=01;35:.mpc=01;35:.ogg=01;35:*.wav=01;35:'
MACHTYPE=i686-pc-msys
MAKE_MODE=unix
MSBUILD_ROOT=/volumes1/build/
MSENVIRONMENT_PATH=/data/cmsadmin/environment
MSRELEASE_ROOT=/data/id/release
MSSITE_NAME=MAPSCAPE_EINDHOVEN
MSYSTEM=MINGW32
NUMBER_OF_PROCESSORS=8
OLDPWD=/data/users/hans.vanpinxteren
OPTERR=1
OPTIND=1
OS=Windows_NT
OSTYPE=msys
PATH='/data/cmsadmin/environment/release/MScms/Environment_latest/i686_MINGW32_1.0.17:/data/cmsadmin/environment/release/MScms/Environment_latest:.:/usr/local/bin:/mingw/bin:/bin:/mingw/bin:/c/cmake-2.8.12.2-win32-x86/bin:/c/Program Files/Java/jdk1.7.0_79/bin:/c/apache-ant-1.9.3/bin:/c/Program Files/7-Zip:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/c/Program Files (x86)/Bazaar:/c/Program Files/Git/cmd'
PATHEXT='.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC'
PIPESTATUS=([0]="0")
PPID=1
PROCESSOR_ARCHITECTURE=x86
PROCESSOR_ARCHITEW6432=AMD64
PROCESSOR_IDENTIFIER='Intel64 Family 6 Model 45 Stepping 7, GenuineIntel'
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=2d07
PROGRAMDATA='C:\ProgramData'
PROGRAMFILES='C:\Program Files (x86)'
PROGRAMFILES(X86)='C:\Program Files (x86)'
PROGRAMW6432='C:\Program Files'
PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
PS4='+ '
PSMODULEPATH='C:\Windows\system32\WindowsPowerShell\v1.0\Modules\'
PUBLIC='C:\Users\Public'
PWD=/data/users/chunhui.li
PYTHONPATH=/data/id/release/bzr/current/lib/python
SHELL=/bin/sh
SHELLOPTS=braceexpand:hashall:interactive-comments
SHLVL=1
SSHSESSIONID=2555
SSHWINGROUP='Development and Innovation'
SSHWINGROUPDOMAIN=MAPSCAPE
SSHWINUSER=chunhui.li
SSHWINUSERDOMAIN=MAPSCAPE
SSH_CLIENT='10.57.101.161 57092 22'
SSH_CONNECTION='10.57.101.161 57092 10.57.2.157 22'
SYSTEMDRIVE=C:
SYSTEMROOT='C:\Windows'
TEMP=/tmp
TEMPDIR=/tmp
TERM=cygwin
TMP=/tmp
TMPDIR=/tmp
UID=500
USER=chunhui.li
USERDOMAIN=MAPSCAPE
USERNAME=chunhui.li
USERPROFILE='C:\Users\chunhui.li'
WINDIR='C:\Windows'
WINDOWS_PATH='/mingw/bin:/c/cmake-2.8.12.2-win32-x86/bin:/c/Program Files/Java/jdk1.7.0_79/bin:/c/apache-ant-1.9.3/bin:/c/Program Files/7-Zip:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/c/Program Files (x86)/Bazaar:/c/Program Files/Git/cmd'
WINDOWS_TRACING_FLAGS=3
WINDOWS_TRACING_LOGFILE='C:\BVTBin\Tests\installpackage\csilogfile.log'
WINSSHDGROUP='Development and Innovation'
WINSSHDGROUPDOMAIN=MAPSCAPE
_=/data/cmsadmin/environment/bin/profile
i=/etc/profile.d/home.sh
[03/02/17 16:35:21] [SSH] Checking java version of java
[03/02/17 16:35:25] [SSH] java -version returned 1.7.0_79.
[03/02/17 16:35:25] [SSH] Starting sftp client.
hudson.util.IOException2: Could not copy slave.jar into '/volumes1/jenkins_build' on slave
at hudson.plugins.sshslaves.SSHLauncher.copySlaveJar(SSHLauncher.java:1057)
at hudson.plugins.sshslaves.SSHLauncher.access$300(SSHLauncher.java:139)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:726)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:709)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.trilead.ssh2.SFTPException: The requested operation failed. (SSH_FX_FAILURE: An error occurred, but no specific error code exists to describe the failure.)
at com.trilead.ssh2.SFTPv3Client.statBoth(SFTPv3Client.java:440)
at com.trilead.ssh2.SFTPv3Client.stat(SFTPv3Client.java:455)
at hudson.plugins.sshslaves.SFTPClient._stat(SFTPClient.java:60)
at hudson.plugins.sshslaves.SSHLauncher.copySlaveJar(SSHLauncher.java:1021)
... 7 more
[03/02/17 16:35:28] Launch failed - cleaning up connection
[03/02/17 16:35:28] [SSH] Connection closed.

[03/02/17 16:59:13] [SSH] Opening SSH connection to WIN7VM06:22.

[03/02/17 16:59:15] [SSH] Authentication successful.

[03/02/17 16:59:20] [SSH] The remote users environment is:

ALLUSERSPROFILE='C:\ProgramData'
ANT_HOME='C:\apache-ant-1.9.3'
APPDATA='C:\Users\chunhui.li\AppData\Roaming'
BASH=/usr/bin/bash
BASH_ARGC=()
BASH_ARGV=()
BASH_EXECUTION_STRING=set
BASH_LINENO=()
BASH_SOURCE=()
BASH_VERSINFO=([0]="3" [1]="1" [2]="17" [3]="1" [4]="release" [5]="i686-pc-msys")
BASH_VERSION='3.1.17(1)-release'
BITVISESFSDLL=00000DD8-07D86ABF-E166485C-ADF7854D
BZR_PROGRESS_BAR=none
BZR_REMOTE_PATH=/data/cmsadmin/environment/release/MScms/Environment_latest/bzr
COMMONPROGRAMFILES='C:\Program Files (x86)\Common Files'
COMMONPROGRAMFILES(X86)='C:\Program Files (x86)\Common Files'
COMMONPROGRAMW6432='C:\Program Files\Common Files'
COMPUTERNAME=WIN7VM06
COMSPEC='C:\Windows\system32\cmd.exe'
CVConfigPath=/data/cmsadmin/environment/cmsadmin/CVconfig
CV_HOSTTYPE=i686_MINGW32_1.0.17
DIRSTACK=()
EUID=500
FP_NO_HOST_CHECK=NO
GROUPS=()
HISTCONTROL=ignoredups:ignorespace
HISTFILE=/data/users/chunhui.li/.bash_history
HISTFILESIZE=2000
HISTSIZE=1000
HOME=/data/users/chunhui.li
HOMEDRIVE='
'
HOMEPATH='USERSERVER\homes'
HOMESHARE='\\USERSERVER\homes'
HOSTNAME=WIN7VM06
HOSTTYPE=i686_MINGW32_1.0.17
IFS=$' \t\n'
JAVA_HOME='C:\Program Files\Java\jdk1.7.0_79'
LOCALAPPDATA='C:\Users\chunhui.li\AppData\Local'
LOGNAME=chunhui.li
LOGONSERVER='
FILESERVER'
LS_COLORS='no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:tw=30;42:ow=34;42:st=37;44:ex=01;32:.cmd=01;32:.exe=01;32:.com=01;32:.btm=01;32:.bat=01;32:.tar=01;31:.tgz=01;31:.arj=01;31:.taz=01;31:.lzh=01;31:.zip=01;31:.z=01;31:.Z=01;31:.gz=01;31:.bz2=01;31:.deb=01;31:.rpm=01;31:.jar=01;31:.jpg=01;35:.jpeg=01;35:.gif=01;35:.bmp=01;35:.pbm=01;35:.pgm=01;35:.ppm=01;35:.tga=01;35:.xbm=01;35:.xpm=01;35:.tif=01;35:.tiff=01;35:.png=01;35:.mov=01;35:.mpg=01;35:.mpeg=01;35:.avi=01;35:.fli=01;35:.gl=01;35:.dl=01;35:.xcf=01;35:.xwd=01;35:.flac=01;35:.mp3=01;35:.mpc=01;35:.ogg=01;35:*.wav=01;35:'
MACHTYPE=i686-pc-msys
MAKE_MODE=unix
MSBUILD_ROOT=/volumes1/build/
MSENVIRONMENT_PATH=/data/cmsadmin/environment
MSRELEASE_ROOT=/data/id/release
MSSITE_NAME=MAPSCAPE_EINDHOVEN
MSYSTEM=MINGW32
NUMBER_OF_PROCESSORS=8
OLDPWD=/data/users/hans.vanpinxteren
OPTERR=1
OPTIND=1
OS=Windows_NT
OSTYPE=msys
PATH='/data/cmsadmin/environment/release/MScms/Environment_latest/i686_MINGW32_1.0.17:/data/cmsadmin/environment/release/MScms/Environment_latest:.:/usr/local/bin:/mingw/bin:/bin:/mingw/bin:/c/cmake-2.8.12.2-win32-x86/bin:/c/Program Files/Java/jdk1.7.0_79/bin:/c/apache-ant-1.9.3/bin:/c/Program Files/7-Zip:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/c/Program Files (x86)/Bazaar:/c/Program Files/Git/cmd'
PATHEXT='.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC'
PIPESTATUS=([0]="0")
PPID=1
PROCESSOR_ARCHITECTURE=x86
PROCESSOR_ARCHITEW6432=AMD64
PROCESSOR_IDENTIFIER='Intel64 Family 6 Model 45 Stepping 7, GenuineIntel'
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=2d07
PROGRAMDATA='C:\ProgramData'
PROGRAMFILES='C:\Program Files (x86)'
PROGRAMFILES(X86)='C:\Program Files (x86)'
PROGRAMW6432='C:\Program Files'
PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
PS4='+ '
PSMODULEPATH='C:\Windows\system32\WindowsPowerShell\v1.0\Modules\'
PUBLIC='C:\Users\Public'
PWD=/data/users/chunhui.li
PYTHONPATH=/data/id/release/bzr/current/lib/python
SHELL=/bin/sh
SHELLOPTS=braceexpand:hashall:interactive-comments
SHLVL=1
SSHSESSIONID=2558
SSHWINGROUP='Development and Innovation'
SSHWINGROUPDOMAIN=MAPSCAPE
SSHWINUSER=chunhui.li
SSHWINUSERDOMAIN=MAPSCAPE
SSH_CLIENT='10.57.101.161 60340 22'
SSH_CONNECTION='10.57.101.161 60340 10.57.2.157 22'
SYSTEMDRIVE=C:
SYSTEMROOT='C:\Windows'
TEMP=/tmp
TEMPDIR=/tmp
TERM=cygwin
TMP=/tmp
TMPDIR=/tmp
UID=500
USER=chunhui.li
USERDOMAIN=MAPSCAPE
USERNAME=chunhui.li
USERPROFILE='C:\Users\chunhui.li'
WINDIR='C:\Windows'
WINDOWS_PATH='/mingw/bin:/c/cmake-2.8.12.2-win32-x86/bin:/c/Program Files/Java/jdk1.7.0_79/bin:/c/apache-ant-1.9.3/bin:/c/Program Files/7-Zip:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/c/Program Files (x86)/Bazaar:/c/Program Files/Git/cmd'
WINDOWS_TRACING_FLAGS=3
WINDOWS_TRACING_LOGFILE='C:\BVTBin\Tests\installpackage\csilogfile.log'
WINSSHDGROUP='Development and Innovation'
WINSSHDGROUPDOMAIN=MAPSCAPE
_=/data/cmsadmin/environment/bin/profile
i=/etc/profile.d/home.sh
[03/02/17 16:59:24] [SSH] Checking java version of java

[03/02/17 16:59:29] [SSH] java -version returned 1.7.0_79.
[03/02/17 16:59:29] [SSH] Starting sftp client.

hudson.util.IOException2: Could not copy slave.jar into '/volumes1/jenkins_build' on slave
at hudson.plugins.sshslaves.SSHLauncher.copySlaveJar(SSHLauncher.java:1057)
at hudson.plugins.sshslaves.SSHLauncher.access$300(SSHLauncher.java:139)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:726)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:709)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.trilead.ssh2.SFTPException: The requested operation failed. (SSH_FX_FAILURE: An error occurred, but no specific error code exists to describe the failure.)
at com.trilead.ssh2.SFTPv3Client.statBoth(SFTPv3Client.java:440)
at com.trilead.ssh2.SFTPv3Client.stat(SFTPv3Client.java:455)
at hudson.plugins.sshslaves.SFTPClient._stat(SFTPClient.java:60)
at hudson.plugins.sshslaves.SSHLauncher.copySlaveJar(SSHLauncher.java:1021)
... 7 more
[03/02/17 16:59:40] Launch failed - cleaning up connection
[03/02/17 16:59:40] [SSH] Connection closed.

I can manually copy slave.jar into '/volumes1/jenkins_build' with the same user.