SharePoint Web Applications Authentication

Trying to figure out what the best way is to accomplish this.

We have mysites setup under it's own web application.
We also have some other sharepoint sites setup under their own web applications. What I'm trying to figure out, is how when a user is in logged into one of the web applications and say they click on their mysites link, they get prompted to sign in again when switching to the mysites web application when a user is not on our corporate network.

As long as they are on a company computer in our domain it's fine, but when a user isn't on a company computer, or in our domain when they access our sharepoint sites, they are prompted to login when going between web applications that they haven't already authenticated to.

Is there a way so that when a user logs into 1 web app, they are already authenticated against the other web apps?
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themightydudeAsked:
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Jamie McAllister MVPSharePoint ConsultantCommented:
My first thought here was SSO, but looking into it, the suggestion seems to be an SSO in front of SharePoint for external access such as UAG. This is Trevor Sewards suggestion;

https://social.technet.microsoft.com/forums/sharepoint/en-US/e466f96c-2cb3-40bd-8fe8-75bd377f57bc/external-access-to-my-sites-and-portal-no-reauthentication

This is the most useful advice I can dig up.

Second most was the comment from Thomas here, but it doesn't entirely nail your specific scenario;

http://sharepoint.stackexchange.com/questions/67891/single-sign-on-between-two-web-applications
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themightydudeAuthor Commented:
That second link mentions using ADFS. Do you think that would work instead of UAG?

We've been playing with ADFS for some external organizations, and seems like that would be the easier r route instead of having to setup a forefront box.
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Jamie McAllister MVPSharePoint ConsultantCommented:
It seems like it might be a viable route, but to ultimately make that call you need to resort to paying a local professional to understand your environment fully.
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themightydudeAuthor Commented:
Ok. Thank you for the information.
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