I would like to generate custom survey url ie want user to land some other server & then redirected to the server where imesurvey is installed. Can you please suggest how can we do that?

This is not really a Limesurvey issue, but a general web programming issue.

However, with custom URLs you will not be able to use the Limesurvey function to send email the survey link.

But to be able to give you some ideas what you can do, it would be important to have more information. How are people invited to the survey? Do you need individual links for each respondent or could it be an open survey? Why do you need to pass the respondents through another server first? Do they need to see something on this other server? Is there a webpage with a link? Or is it really just a redirect? Then you could always use .htaccess to redirect.

Thanks Holch for your reply.
In my case, I have installed limesurvey in server within our LAN & not accessible directly outside from the LAN. So i need to send the participant a survey url (with tokens) of some other server's url which is hosted outside LAN and from there they will be redirected to limesurvey server.

For eg, current survey url which goes to the participant looks like https://192.168.1.10/....... . I would like to modify this link to ourserver.com/ ....

The survey will be closed one so the url will carry tokens also.

If your server is not accessible directly from outside the LAN, than a redirect won't work either. The problem is: It is NOT accessible from outside of your LAN.

There is no way to get someone access your survey if the server has no public IP. You will need to find a different solution.

How can I get survey id variable in email template. {SID} is not working. Any suggestion?

Is there any way to get the survey id in email? Then I can create the custom url.