Teamviewer Proxy Error Windows 10
Christal Rasband
Your TeamViewer needs to connect to our servers over port 5938. Please make sure that the TeamViewer application is not being blocked by your firewall or security software, and that port 5938 is open in your firewall or router for outgoing connections.
It only works if we allow port 5938 from our clients directly to your server infrastructure.
TeamViewer 10 works totally fine with our configuration. And 11&12 worked as well a few weeks/months ago. So we assume that there were a change on your side. We are not able to allow port 5938 to the outside. Is there any known workaround or another solution available?
I've tried to allow all communication (I've turned off my firewall) and became still the same information about need of setting up proxy parameters. I don't use proxy. I've uninstalled and installed again Teamviewer (ver. 13 on Win 10, 64) with removing all settings and there is still the same problem.I've removed my Teamviewer account and created a new one, them installed Teamviewer again - the problem occures again. The first time I get the error message was when I restored my hard drive from the image ( there was Teamviewer ver. 12 )
I use TeamViewer 12 and got the error message after using 12 for months. I was unable to find the Proxy information. However, I deleted TeamViewer 12 completely and reloaded it. That solved the issue.
Same problem! Problem exists since 2017! Is there any solution? Reinstalling does nothing. Where is the real issue? Every time I upgrade TeamViewer I need to reinstall my Windows? R U serious TeamViewer Team?
I have never even touched the proxy settings in teamviewer ever. I have no programs that should be interfering with my network/port settings AT ALL aside from teamviewer. Haven't had a problem for years until lunch today, in which I stopped being able to access the device I usually connect to.
Teamviewer is the only program on my main PC that is having trouble with connections. I checked on the device (PC I use as a server on the other side of the house) and it is connecting to teamviewer without any errors or problems.
last week our Teamviewer connections suddenly stopped working from one day to the other. After hours of searching the source of the issue, I finally reached the point where I can tell it is caused by the webfilter of our SG230 UTM 9.510-5. Following behaviour:
- proxy in standard mode
- webfilter log shows 504 errors with timeouts while trying to reach ping3.teamviewer.com
- tcpdump on client shows the the connection gets interrupted and tries to retransmit the initial packet several times
- firewall log shows blocked packages from client to teamviewer server (I assume the retransmit packages get blocked because they do not pass thru the webfilter but over 443)
I also played around a lot with web filtering options, settings, website tagging, etc. Without any success... well, at some point I got rid of webfilter and firewall log entries, but the connection still die not work.
Do you have an FQDN in 'Address' and *.teamviewer.com in 'Exceptions'? If you do that, your browser should skip the Proxy in Standard mode. The 'Transparent Mode Skiplist' does not apply in Standard Mode.
What I forgot to mention is, that our firewall does not connect to the internet directly. Because we are in a governmental network (called "KDN"), our SG forwards http/s traffic to a parent web proxy. That's why the settings on client side do not have any effect I guess. But: skipping our proxy on client side by entering the KDN proxy directly to the proxy settings does not work either.
With the browser's 'LAN Settings' properly configured, it will work in Standard mode, Philipp. That causes the browser to skip the Standard Proxy. For my use of TeamViewer, I don't need to skip the Proxy as the Exception noted above solves the problem for me. I don't know of any other needed configuration, but it has been several years... You could check the Web Filtering log file to see what's getting tripped up. If you do, please post back here to let us know.
Tools like TeamViewer need a session from the desktop device. The whole purpose of Standard Mode is to create the session from the UTM device. So the technologies are fundamentally incompatible. You need to exclude teamviewer.com from your proxy script rather than at the UTM level.
Also like most remote access solutions, TeamViewer uses two sessions, one on https for authentication, and one on port 5938 for the actual session. As others have noted, the second session uses an IP address instead of a name, and it chooses from servers all over the world. So Country Blocking can cause problems as well.
I have Transparent Mode enabled as well as Standard mode, so the Standard Mode bypass still hits the webfilter in transparent mode, but transparent mode only affects the port 443 session. Then I have a rule to override country blocking for designated source addresses connecting to port 5938.
A few days ago it suddenly started working again. Probably wasn't an issue caused by the firewall. Probably a couple of problems between our government net and some teamviewer servers. This answer of Bob probably would fit best as answer if it have not been a problem caused by "external" issues.
I've seen this happening when the two computers are using different versions, but recently I believe Comcast/Xfinity made a change either on the network-side of things, or pushed out updates to their cable modems, which caused this problem.
I and others have been able to solve it on Windows PC's by disabling the IPV6 Protocol under Control Panel > Network > Network Adapter Settings > Right Click on your network adapter and uncheck to disable the IPV6 protocol. This fixed my problem immediately.
Hi I had the same problem tried uninstalling and reinstalling etc. Fixed the issue of protocol negotiation failed by going to my anti virus program avast and in settings > exclusions > browse for the install file path for teamviewer and select the entire folder. It now works. Do this for other pc's that have teamviewer on them.
Ran into another cause for this error. In my case I was working with a system that turned out to be heavily infected with adware and a few virus signatures. Not sure which but it appears at least one of them was intentionally blocking teamviewer so as to prevent remote support? Had to fall back to an alternative remote software (Remote Utilities) to clean it up with Malware Bytes and Avira (AVG wasn't cutting it I guess?) and then TeamViewer started working again.
I had this issue today. I can't say that I know the cause, but I managed to work around it by selecting the remote computer's friendly name in the Partner ID dropdown, then entered the password that I'd set for that machine. When I did this, it worked immediately. This will only work for computers where you have the friendly name in your list, and you know the TV password to connect to it.
After having done my fix, I got the same error. I tried setting the proxy-setting back to recommended and then saved it. Then I also changed 'Incoming LAN connections' and activated that (it was set to deactivated). I am connecting to it from the same local area network.
I was trying to use teamviewer on ubuntu 14.04 to connect my win10 at home. Kinds of error came out during my trials. Finally I find that it's the software version that blocks me to connect. After download & re-install from here:
I have a dual boot win10/Ubuntu system. I had been out of the ubuntu a couple of days. After logging in this a.m. I ran sudo apt-get update. Then sudo apt-get upgrade and there was an error code relating to teamviewer.
It won't impact on your Teamviewer which is installed. In future you can install latest teamviewer by downloading debian package from its official site. Above file will be generated automatically when you install it.
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