Jira: Adding a Link to in issue doesn't work for a project - jira

I've been using Jira recently and I came across a problem that I don't know how to fix it.
I have to Jira instances. when I try to link an issue to one on the other instance it doesn't link. It used to work but now it won't.
every time I try to link it I will get this even though for other projects it wasn't needed :
and when press authenticate I get this page:
afterward, when I press the link nothing changes.
Please if you are familiar with this problem help me.
afterward, when I press the link nothing changes.
I tried to link the other way and it's working but I still can't identify where the problem is.
Please if you are familiar with this problem help me.

It's all about Application Links.
Some server changes (like reverse proxy, update in web.xml, etc.) or changes in the admin user account may break the links.
You need the check Application Links between two instances; if there is a problem, try to solve that first.
If not, remove the application link from both instances and add it again.
By the way, if the users in the two Jira instances are same, enable the "OAuth" in the application links (and also be sure that the admin account is same on these two instances.)
Sources:
Linking issues
Application Links

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Ok. sorted this out.
My thanks to those who looked over this question. Basically I deleted the current projects and started again. the device model registration is right down (scroll right down to) the bottom of the page on the first screen after you have first created the project. Apparently you need to not skip this step, or navigate away from this page before you do the device creation.
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I am new to coding and everytime I ask a question I feel like stupid because I mostly am unfamiliar with most known things in this "industry" so I will sum up the whole situation fastly.
I learned how to code html css and js, I learned how to use VS 2012 asp.net mvc 4 and finally I made a webside for a student club I am into. Hosting is provided by our school and they only gave me ftp user name and password, I dont know which hosting firm is it or what is going on and so on, I got Filezilla to delete and unpublish the old webside, and I didnt know a proper way to publish asp.net websides through filezilla so I used VS 2012 publish tool.
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Problems I faced were;
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I was trying to make a nav with sub items on it, It worked while I was trying it on local host I saw similar problems spoken out here on VS 2010 I tried to make exstensions to VS didnt work out
Anyway I deleted that part from the project and I tried publishing again.
2)It worked out perfect it seemed like no problem occoured. But when I try to open the webside it was saying I had no permisson to view.
I hope I didnt write any off topic staff here just try to tell you my problems so maybe someone can get help like I did from prior topics.
" Validation (HTML5): Element 'a' must not be nested within element 'a
button' "
You cannot have one anchor tag inside another anchor tag. If you have it that will cause you the problem.
Check out this thread to find out valid elements which can be nested inside an Anchor tag.
I had no permisson to view.
You need to give proper read/write permissions for the ApplicationPool Identity on the folder structure you have for your website. Or else IIS Apppool will not be able to get the files and execute them.
Give permissions to AppPool Identity for a particular folder/file. That resource will guide you one how to give you permissions to Application Pool Identity.
Alternatively you can give permissions from FileZilla itself. Simply right click the application root folder and select permissions. Then you can specify permissions from client side itself. But in most of the production cases, we have to add app pool user to the folder/file permissions list manually. But definitely give a try with FileZilla.

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Check that you are using the same browser with all dependencies installed (java)
Consider re-indexing JIRA from the Administration Panel
Check your schemes to insure you don't have non-applicable dupes
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