Comcast Business Internet Closing Connection with Google Drive while Syncing via SyncDocs

login into your comcast cable modem, click on the cable modem part of it and paste the signal levels here so we can see them.   You probably are dropping packets due to some sort of disturbance on the line.

Downstream Channel
Downstream Frequency 608.997803 MHz        614.999023 MHz          621.000366 MHz             627.001587 MHz
Lock Status                        Locked                           Locked                             Locked                          Locked
Modulation                         256 QAM                        256 QAM                         256 QAM                      256 QAM
Symbol Rate                      5.360537Msym/sec         5.360537Msym/sec        5.360537Msym/sec       5.360537Msym/sec
Downstream Power           -1.885171 dBmV             -2.987270 dBmV            -3.822639 dBmV            -2.779215 dBmV
SNR                                  37.355988 dB                  37.355988 dB                  37.935909 dB                 37.355988 dB

Upstream Channel
Upstream Frequency                23000000 Hz                 35800000 Hz                     29400000 Hz
Lock Status                                  Locked                            Locked                               Locked
Modulation                                   64QAM                           64QAM                               64QAM
Symbol Rate                                5120 KSym/sec               5120 KSym/sec                  5120 KSym/sec
Upstream Power                          41.2500 dBmV                41.2500 dBmV                   42.7500 dBmV
Channel ID                                    7                                     5                                          6

Also, as I worked through my error logs I have found more detail, suggesting a SSL certificate error...Look at the line here from the error logs..."Authentication failed because the remote party has closed the transport stream"

5/11/2017 8:25:52 AM(ver. 6.931) Failed to connect to Google Drive v2. Check your Internet connection.
If your connection is OK, you may need to set up the Proxy Server settings.
If this is not the cause, look at the error log in the Advanced tab in the Preferences menu.
The underlying connection was closed: An unexpected error occurred on a send. System.Net.WebException : sd criticality=6
Inner: System.IO.IOException: Authentication failed because the remote party has closed the transport stream.
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.ConnectStream.WriteHeaders(Boolean async)
Source: Syncdocs : sd criticality=6

Hello hlothrop and welcome to forums,

Have you noted any packet loss at these times? I understand you can reach the site via a web browser but are you able to test the sync on another system?

Not sure I understand the question.  Here's a guess at an answer...Yes, I can reach Google Drive via a web browser...and Yes, I can sync to/from Google Drive without error using SyncDocs if I connect via the AT&T ISP.    If you were looking for other info, please respond back.  Thanks.

Michael, I am constantly having issues connecting for this sync, but only for this sync, and only since May 3.

This is not an "it works sometimes and sometimes it doesn't" problem.  This is an "It stopped working May 3 and has never worked at all since not even a little bit when on the Comcast Business ISP" problem.

I have tried temporarily disabling my fiirewall completely (already had a rule allowing connection to/from) although that never was an issue.  Firewall cleared as a potential problem.

I have tried changing from a connection wired into my switch to a connection wired directly into the back of my Comcast modem.  No improvement, but also clears my internal network as being the source of the problem.

And, as I have mentioned I have even tried using another ISP's network, which allowed me to connect/sync as designed, so it's pretty much eliminated Google Drive, SyncDocs or my internal network as causes.

I've had good experience with Comcast Business, but if I can't get this resolved I'm going to have to consider changing.

Thank you,

I have completed the IPv4 only push. Would you please test your sync connection now?

Just let me know if now is a good time for the push. It is usually fast but can take up to 40 minutes to complete. I do not want to make an interruptions in your day.

No problem just post here and we can move forward if the issue persists.

Will do.  It may take as long as 1 hour for me to have results.

Sure.  I'm game to try most anything.  I certainly appreciate your help.   What do you need me to do?

Thank you,

In an attempt to further isolate the issue I would like to force your modem into a temporary IPv4 only mode. This would force re-registration to the network allowing for a different routing through the routing table to be used. If for any reason this feature restores it may highlight a system(s) on our network that needs to have its security certificate updated. This process can take up to 40 minutes to complete. Is this an option you would like to try at this time?

Now is good