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I'm hoping the solution is easy. I'm not the most knowledgable about these things. This is what happens. Pretty annoying since the launcher worked fine until Thursday last week, November 12, 2015.

[01:46:38 INFO]: Minecraft Launcher 1.6.48 (through bootstrap 100) started on osx...
[01:46:38 INFO]: Current time is Nov 20, 2015 1:46:38 AM
[01:46:38 INFO]: System.getProperty('os.name') == 'Mac OS X'
[01:46:38 INFO]: System.getProperty('os.version') == '10.11'
[01:46:38 INFO]: System.getProperty('os.arch') == 'x86_64'
[01:46:38 INFO]: System.getProperty('java.version') == '1.8.0_60'
[01:46:38 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[01:46:38 INFO]: System.getProperty('sun.arch.data.model') == '64'
[01:46:38 INFO]: proxy == DIRECT
[01:46:38 INFO]: JFX is already initialized
[01:46:39 INFO]: Refreshing local version list...
[01:46:39 INFO]: Refreshing remote version list...
[01:46:44 INFO]: Refresh complete.
[01:46:44 INFO]: Loaded 2 profile(s); selected 'OptiFine'
[01:46:44 INFO]: Refreshing auth...
[01:46:44 INFO]: Logging in with access token
[01:47:00 ERROR]: Exception whilst logging into profile
com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server
at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:71) ~[launcher.jar:1.6.48]
at com.mojang.authlib.yggdrasil.YggdrasilUserAuthentication.logInWithToken(YggdrasilUserAuthentication.java:132) ~[launcher.jar:1.6.48]
at com.mojang.authlib.yggdrasil.YggdrasilUserAuthentication.logIn(YggdrasilUserAuthentication.java:55) ~[launcher.jar:1.6.48]
at net.minecraft.launcher.Launcher.ensureLoggedIn(Launcher.java:215) [launcher.jar:1.6.48]
at net.minecraft.launcher.Launcher$2.run(Launcher.java:169) [launcher.jar:1.6.48]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_60]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_60]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_60]
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:209) ~[?:1.8.0_60]
at java.net.SocketInputStream.read(SocketInputStream.java:141) ~[?:1.8.0_60]
at sun.security.ssl.InputRecord.readFully(InputRecord.java:465) ~[?:1.8.0_60]
at sun.security.ssl.InputRecord.read(InputRecord.java:503) ~[?:1.8.0_60]
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973) ~[?:1.8.0_60]
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375) ~[?:1.8.0_60]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403) ~[?:1.8.0_60]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387) ~[?:1.8.0_60]
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559) ~[?:1.8.0_60]
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185) ~[?:1.8.0_60]
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1282) ~[?:1.8.0_60]
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1257) ~[?:1.8.0_60]
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250) ~[?:1.8.0_60]
at com.mojang.authlib.HttpAuthenticationService.performPostRequest(HttpAuthenticationService.java:73) ~[launcher.jar:1.6.48]
at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:54) ~[launcher.jar:1.6.48]
... 9 more