How to resolve 'No Internet Connection' error

[Guest]

Here's what I found...

The application reports back that there is no Internet connection (there is, of course -- EVERYTHING else works just fine and Adobe used to work fine as well).  Troubleshooting revealed that this only occurs when going through an ethernet connection, works fine when going through WiFi or through a proxy.  This is all from a home network.

1) PC-->Ethernet Switch-->Asus Router = "No Internet Connection"

2) PC-->Asus WiFi AP -->Asus Router = WORKS!

3) PC-->Ethernet Switch-->Asus Router-->Zscaler Proxy = WORKS!

Wireshark shows nothing more than TCP retransmissions (after all the initial TCP and TLS/SSL handshakes), indicating that they are not able to continue their communication.  Very odd.  My high level assessment is that the client software is just not communicating quite right per the RFCs, at least on a standard ethernet frame. Someone at Adobe is going to have to go really deep to figure this one out.

For the techies, the ethernet switch is a Juniper EX2200C, running the latest software (12.3R9.4 --- having also upgraded from 12.3R3 just to rule that one out).  There are not security or other non-standard configs.  Again, EVERYTHING else works just fine.  Everything.     

[Jeffrey_A_Wright]

Branching to a new discussion.

[Guest]

Further analysis revealed that CC is incorrectly sending jumbo frames.  While I do have Jumbo frames enable on my LAN, the interface to the router is set at the default (1514) and the router itself does not have jumbo frames enabled.  So, there is no good reason why CC software should not negotiate the appropriate 1514 byte connection for an Internet-based application, just like everything else does.  Thankfully, armed with the additional information I quickly found this thread (Adobe Creative Cloud doesn't work with Jumbo Frames?!), showing that it is a known issue that Adobe is working on.  Now I just wish that information had been communicated to the support team (both chat and phone), even called out on a list of known issues for the "no Internet connection" issue.