Why can't I link certain portals after creating a field?

So I noticed that after I created a pretty big field in Syracuse University I was unable to link certain portals. More specifically, Bird Library portal. I do have Bird Library keys, so I'm not sure why I can't link these :| Are my fields/links in the way?

Usually, when a portal cannot be linked, there are two possibilities:

1) the portal is out of reach. This should not be the case, since, with the configuration you've showed, you would have had range problems only with L1 portals;

2) as you correctly said, there are fields and links in the way. It's impossible to cross two links, even if they are from your own faction. With the field configuration you've created, the only portals that can be linked to the Bird Library are these (one is under the word "resonators"):

Creating a link from these portals, if their level is high enough, should give you no problem. The rest is blocked by the field mantained by those two same portals. That's why, as a general rule, you should try to make your links the shortest possible: you always risk to block the creation of links/fields for you or your fellow agents.

@Shelby. S Example :

You have the fields created by some reason in this form

Black links has been created and you have 3 fields.

If you try to create a link from some portal that is inside from one to is outside --> is not possible.

If you try to create a link from some portal that is outside from one to is inside --> is possible.

You CANT cross a link with another one.

In this image I made, now you have 3 fields. If you throw a link from bottom left portal, to the portal in the center, you create 2 fields more, because you "cut" in a half another field.

The linkability is actually very straightforward, once you understand a few simple rules.

Prerequisites:

• Source portal must be fully deployed
• Destination portal must be fully deployed
• A portal can have maximum 7 8 outgoing links. Incoming links are not capped.

Then:

1. The source portal can't be under a field. (Though the destination portal can.)
2. The destination portal must be within a range. (The range can be extended using LinkAmps.)
3. There must not be any crossing links on the link path.

Here is an example of what a portal under a field looks like and what doesn't.

• Red portals are under a field.
  You won't be able to create links from them, however, you may link to them.

• Orange portals are not under a field, despite the looks.
  You can link from and to orange circled portals.

Note that there are double and triple fields too. (Smart-linking can boost your AP gain :))