Sharepoint 2010, can't check out doc from library

After a good few months working without a problem, now external users connecting to our sharepoint intranet can't opent documents in our library.
The message stating that the doc is already checked out or he/she doesn't have persmissions to open it.
I've tried with an admin account and have the same problems, although this seems to happen only to users conencting from the outside (via VPN) not to internal users.

Sharepoint 2010 onto Windows 2008 R2, users all onto IE8 for connection
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dp_expertConnect With a Mentor Commented:
Check-in and checkout are using a web service. If it happens only for external users then I would look at the firewall or your network settings - probably something is blocking the web service or some other protocoles.
txarli33Author Commented:
The permissions to users are contribute, they've worked fine until now.
txarli33Author Commented:
as a note, the documents are not checked out or locked for editing by anybody else
txarli33Connect With a Mentor Author Commented:
I found a way around it.
As you mention, happening just for external access suggest some problem with firewall or network settings but didn't find any.
I believe is either that or/and a problem with javascript on the browser

What i did is change (in sharepoint's edit the document library) the way docs are opened, instead of using the browser they now open the office app needed (word or excel) and then the doc opens fine.
It is an acceptable solution although it doesn't fix the initial problem.
txarli33Author Commented:
given points to dp_expert for help given although no solution to specific problem has been done
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