In the Applications Manager Log this message occured:
[AJPRequestHandler-HTTPThreadGroup-22][21:43:8:818, 1/17/11] URLFETCHUTIL: Opened Connection to: http://updates.oracle.com/ARULink/XMLAPIemail@example.comfirstname.lastname@example.org&language=0
[21:44:25:97, 1/17/11] oracle.apps.fnd.oam.sdk.util.url.URLFetchException: Connection timed out (errno:238); Root exception is:
java.net.ConnectException: Connection timed out (errno:238)
Let's try this url in the browser: http://updates.oracle.com gave a time out, but https://updates.oracle.com gave response! So it looks like the link is incorrect / changed. At metalink I found metalink note 1267153.1, but that was for OEM and not OAM. But there is also metalink note: New ARU Access Protocol Requires Patches for Patch Wizard in Oracle E-Business Suite and Patch Manager in Oracle Application Change Management Pack for Oracle E-Business Suite [ID 1267768.1]
A cryptical description, but after applying Patch:10364346 described in the note the Metalink connection from Patch Wizard worked:
This is tested on EBS 12.1.1. on HP Itanium and EBS 12.1.3. on VM Oracle Linux 32 bit.