Turkey does block internet traffic from time to time - not sure if the connection from Incirlic goes through Turkish routers.
Lastest Facebook message from Incirlik 8 hours ago -
https://www.facebook.com/Incirlik-Air-Base-Turkey-135207298748/?rc=p&pnref=story
“Incirlik Air Base - Turkey
For those of you stationed here who are unable to check your email for the latest CAT directives, please send a private message to our Facebook inbox for information on facility hours.”
[CAT might stand for “Crisis Action Team”.]
But did the USA also block Internet traffic dealing with the base being held hostage.