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I have Netgear Stora MS2000 (which uses a modified version of Red Hat) and have strange font issues while connecting by SSH. Note that this occurs both when connecting by PuTTY from Windows and by performing ssh from Mac console.

When I use some Polish letter and type ls it is displayed as two question marks. However, when I try to autocomplete the file name it displays correctly. This is illustrated in the following picture:

Tried to change TERM and LANG variables to different values but without any luck.

I also noticed wrong display of mc, this may (or may not) be related to the same issue:

Any ideas what should I change?

The screens where made from PuTTY but it looks the same from Mac terminal.

EDIT

Answering question from comment, here is output from locale, alias ls and echo młodość | od -t x1:

-bash-3.2$ locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=pl_PL.UTF-8
LC_CTYPE="pl_PL.UTF-8"
LC_NUMERIC="pl_PL.UTF-8"
LC_TIME="pl_PL.UTF-8"
LC_COLLATE="pl_PL.UTF-8"
LC_MONETARY="pl_PL.UTF-8"
LC_MESSAGES="pl_PL.UTF-8"
LC_PAPER="pl_PL.UTF-8"
LC_NAME="pl_PL.UTF-8"
LC_ADDRESS="pl_PL.UTF-8"
LC_TELEPHONE="pl_PL.UTF-8"
LC_MEASUREMENT="pl_PL.UTF-8"
LC_IDENTIFICATION="pl_PL.UTF-8"
LC_ALL=
-bash-3.2$ alias ls
alias ls='ls --color=tty'
-bash-3.2$ echo młodość | od -t x1
0000000 6d c5 82 6f 64 6f c5 9b c4 87 0a
0000013
-bash-3.2$

Based on comment from Gilles I managed to fix this issue. The problem was missing pl_PL locale. I found instructions on PC LOAD LETTER blog:

cd ~/sometemp
wget http://sourceforge.net/projects/dsgpl/files/DSM%203.1%20Tool%20Chains/Marvell%2088F628x%20Linux%202.6.32/gcc421_glibc25_88f628x.tgz
tar xvfz gcc421_glibc25_88f628x.tgz
cd arm-none-linux-gnueabi/arm-none-linux-gnueabi/libc/usr/bin
cp locale /opt/bin
cp localedef /opt/bin
cp -R arm-none-linux-gnueabi/arm-none-linux-gnueabi/libc/usr/share/i18n /usr/share
#-----keep another copy safe in case DSM is reinstalled later
cp -R arm-none-linux-gnueabi/arm-none-linux-gnueabi/libc/usr/share/i18n /opt/share
mkdir /usr/lib/locale

And then by typing:

localedef -c -f UTF-8 -i pl_PL pl_PL.utf8

and relogging everything works.