Internet Explorer having problem with cookies

[m.abdullah]

I'm having problem accessing mantis using internet explorer because of the following message:
"Your browser either does not know how to handle cookies, or refuses to handle them."
I have no problem accessing the mantis using Google Chrome or Mozilla Firefox.
I'm using:
Windows 7
Internet Explorer 11
IIS 7.5
MySQL 6.3
mantisbt 1.2.20

[atrol]

I can't reproduce this.
I remember users having similar issues some while ago where the issue was caused by a proxy server or so called web accelerators like Varnish.

[m.abdullah]

I may have found out what's the cause of the issue but i haven't fix it yet.
I discovered that Internet Explorer have problems storing cookies when the webpage/domain have certain special character in them such as underscores "_".
I'm trying to get my team to change our webpage without any special character.
If it fix the issue, will update here.

[atrol]

Sounds like a known issue
https://www.mantisbt.org/bugs/view.php?id=5886#c11864