Old post but seems the problem is still knocking about, below worked for us as far as changing the error goes:
http://forum.mikrotik.com/viewtopic.php ... ps#p424247
Extract of edited login.html page:
====================================================
<br /><div style="color: #c1c1c1; font-size: 9px">Powered by MikroTik RouterOS</div>
$(if error)<br /><div style="color: #FF8080; font-size: 9px"><script type="text/javascript">
var error = "$(error)";
if (error == "simultaneous session limit reached") {
document.write("simultaneous session limit reached");
}
else if (error == "invalid password") {
document.write("Invalid Password");
}
else if (error == "no valid profile found") {
document.write("Credit limit reached, kinldy top up at reception should you wish to coninue browsing.");
}
else if(error.search("not found") != -1) {
document.write("Unknown Error");
}
else document.write("$(error)<br />")
</script></div>$(endif)
</td>
</tr>
</table>
<script type="text/javascript">
<!--
document.login.username.focus();
//-->
</script>
====================================================
You do not have the required permissions to view the files attached to this post.