Posted by TVscale
Digon

TeamViewer version 12-14 can't establish connection to servers (all of a sudden)

I've used Teamviewer 14 for long time, and just all of a sudden it's unable to connect to servers. I can't even check for updates via App and log into account.

System is Windows 10 (bootcamp MBP mid 2018)

Log files says something about dns and socket errors (flooded with the same strings):

2019/06/27 18:34:29.479  4440  5784 S0!! CHttpConnectionOutgoing::ResolveDNSName: resolving DNS name failed, status = Failed, HTTP response code = 0, URL = 'http://router8.teamviewer.com/cname.aspx'
2019/06/27 18:34:29.479  4440  5784 S0!! CHttpConnectionOutgoing::HandleResolveDNS: empty address, m_ConnectionState=0
2019/06/27 18:34:29.480  4440  5776 S0!  CProcessCommandHandlerKeepAlive[17236]::HandleKeepAliveConnect(): Connect to KeepAliveServer failed
2019/06/27 18:34:29.480  4440  5776 S0!!!KeepAliveSessionOutgoing::ConnectFailureHandler(): KeepAliveConnect to router8.teamviewer.com failed
2019/06/27 18:34:29.481  4440  5776 S0   Waiting 1 seconds to connect to KeepAlive again
2019/06/27 18:34:30.481  4440  5796 S0   CKeepAliveClientClient::StartConnect(): Protocol 8 proxy -- IP router8.teamviewer.com
2019/06/27 18:34:30.481  4440  5796 S0   Activating Router carrier
2019/06/27 18:34:30.481  4440  5796 S0!!!CTcpConnectionBase[17237]::HandleResolve(): Resolve failed, router5.teamviewer.com:5938, Error: system:11001
2019/06/27 18:34:30.481  4440  5776 S0!  CProcessCommandHandlerKeepAlive[17237]::HandleKeepAliveConnect(): Connect to KeepAliveServer failed
2019/06/27 18:34:30.481  4440  5776 S0!!!KeepAliveSessionOutgoing::ConnectFailureHandler(): KeepAliveConnect to router5.teamviewer.com failed
2019/06/27 18:34:30.481  4440  5784 S0   CKeepAliveClientClient::StartConnect(): Protocol 4 proxy -- IP router5.teamviewer.com
2019/06/27 18:34:30.481  4440  5784 S0   Activating Router carrier
2019/06/27 18:34:30.483  4440  5776 S0!! HttpRequestImpl::CurlFinished(): curl request failed: Couldn't resolve host name (6), Could not resolve host: router8.teamviewer.com
2019/06/27 18:34:30.483  4440  5776 S0!! Port443Connection::RequestFinishedCallback: failed with HTTP status code = 0
2019/06/27 18:34:30.483  4440  5784 S0!  CProcessCommandHandlerKeepAlive[17238]::HandleKeepAliveConnect(): Connect to KeepAliveServer failed
2019/06/27 18:34:30.483  4440  5784 S0!!!KeepAliveSessionOutgoing::ConnectFailureHandler(): KeepAliveConnect to router8.teamviewer.com failed
2019/06/27 18:34:30.484  4440  5796 S0   CKeepAliveClientClient::StartConnect(): Protocol 2 proxy -- IP router8.teamviewer.com
2019/06/27 18:34:30.484  4440  5796 S0   Activating Router carrier
2019/06/27 18:34:30.486  4440  5772 S0!! HttpRequestImpl::CurlFinished(): curl request failed: Couldn't resolve host name (6), Could not resolve host: router3.teamviewer.com

Portable version 14 on this PC has no connection as well.

I tried to reinstall full version 14.

Tried install version 13.

Tried change app folder name and manually cleanup all dependent settings in user folder.

I've installed AV software for the first time and scanned PC for viruses. I have bult-in Windows real-time protection settings at lowest possible.

I have firewall disabled globally. However, I tried to allow all inbound/outbound actions for TV app via Windows firewall.

I did reset all Windows network settings with reboot.

I tried flush dns and some netsh commands.

I tried to use 8.8.8.8 dns servers.

I tried to use different WiFi hotspot with my iPhone carrier.

I tried to use OpenVPN connection.

 

I tried to drag and drop TV14 portable into VMware machine on this Win 10 and it has connection with no issues.

The second laptop on Win 7 with TV13 installed within the same WiFi network works fine.

iOS TV app within this WiFi works fine.

I tried to launch old portable versions of TV and 10-11 version works fine to my surprise.

12-14 has no connection.

What the heck, could anyone help? Thanks.

I have disabled Windows 10 updates with 3rd party tool (due to Windows waking up my MBP in carrying sleeve or at night, lol) and latest updates cycle was checked at 07.05.2019.

Local connections via private IP is still possible (TeamViewer sidebar shows iOS client connected, but iOS shows black screen with 'Connecting...', not sure why).

6 Replies
Posted by TVscale
Digon

Re: TeamViewer version 12-14 can't establish connection to servers (all of a sudden)

I've tried w/ and w/o IPv6 checkbox in wifi adapter settings.

Posted by TVscale
Digon

Re: TeamViewer version 12-14 can't establish connection to servers (all of a sudden)

I still have no clue what the heck is going on, but I just installed Fiddler network debugger and if I launch first Fiddler and then teamviewer -- it works without issues! But if I close Fiddler and launch TeamViewer, then again issue persist.

Should you think I am somehow dumb -- no, I'm extremely advanced PC user,  and this issue drives me crazy.

btw connection via private IP still shows black screen

Posted by Closed account
Not applicable

Re: TeamViewer version 12-14 can't establish connection to servers (all of a sudden)

I have experinced the same problem. Deactivating IPv6 solved the problem for me.

 

Posted by TVscale
Digon

Re: TeamViewer version 12-14 can't establish connection to servers (all of a sudden)

Thanks for telling. I have IPv6 checkbox disabled in adapter settings, IPv6 disabled in Google WiFi router and in my ISP control panel.

Posted by TVscale
Digon

Re: TeamViewer version 12-14 can't establish connection to servers (all of a sudden)

I tried to listen all interfaces with Wireshark, and when TeamViewer starts and tell me there's no connection -- there's absolutely zero packets with all interfaces. So TeamViewer somehow has no access to network activity at all.

My system is almost clean and has no strict policies on anything, I have UAC disabled etc. I even can monitor breath of apps looking at packets on interfaces as there's no apps installed. So don't think there's something which I'm not telling or I forgot about.

Highlighted
Posted by TVscale
Digon

Re: TeamViewer version 12-14 can't establish connection to servers (all of a sudden)

I tried TeamViewer Cleanup Tool which cleaned up all hidden teamviewer traces including machine id, but it has no results on connectivity.

Audit of Windows events log shows everything fine. Not a single app or package install since last check of updates (09.05.19), no dependent errors prior to teamviewer stopped working.

I tried to enable Windows updater and install all new Windows updates.

I tried netsat command to see all active connections in case of malicious hidden teamviewer rat taking over teamviewer connection, but this theory failed.

WEIRD!