E212: Can't write a file on /tmp on Linux

I have a problem with writing a file to /tmp as normal user (not root). I got this error when I wanted to write with vi.
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"/tmp/test.txt"
"/tmp/test.txt" E212: Can't open file for writing
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ls -ld /tmp
drwxr-xr-x 11 root root 4096 Jul  9 12:17 /tmp
uname -a
Linux xxx-yyy 2.6.18-128.el5 #1 SMP Wed Dec 17 13:41:38 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
Do you know which part I need to check?
jl66Asked:
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Maciej SsysadminCommented:
You are missing sticky bit on your /tmp. Additionally your user (unless it is root) is not permitted to create files in /tmp.
Run as root:
chmod 1777 /tmp
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omarfaridCommented:
run commands below

chmod 777 /tmp
chmod +t /tmp

and try again
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