"Connection Failed - Invalid protocal!" Appears Randomly

[hicksticks2001]

Yes, I am not trying to connect to anyone. However, I do have my VNC Viewer listening on port 80. When i do that, i get messages every five minutes (even if my computer is doing nothing). The first message reads:

Connection failed - Invalid protocal !

Possible causes:

-You've forgotten to select a DSMPlugin and the Server uses a DSMPlugin
-Viwer and Server are not compatible (they use different RFB protocoles)

The next message reads similar saying:

Connection fialed - Error reading Protocol Version

Possible causes:

-You've forgotten to select a DSMPlugin and the Server uses a DSMPlugin
-Viwer and Server are not compatible (they use different RFB protocoles)
-Bad connection

Last night i left my viewer on listening on port 80 ( i have found that my of my SC clients can get through their firewall that way, some are being strong firewalls), but when i woke up in the morning i had litterally a 100 of these messages stacked up on eachohter saying this.

I'd appreciate any help

[redge]

can you report the vncviewer listen command line you wrote ?

[hicksticks2001]

"C:\Program Files\UltraVNC\vncviewer.exe" -listen 80 -autoscaling

[redge]

vnc server reverse connection to vnc viewer listening

winvnc -connect 123.123.123.123::80 -noregistry
or
winvnc -connect host.domain.com::80 -noregistry

I think you have conflict on computer had 2 services listen same port with web server on port 80 hosting vnc viewer listening on port 80
or/and
config NAT rule port forwarding error

[hicksticks2001]

I'm not having a problem with people connecting on my listening port 80 port. The problem i'm having is with those messages popping up.

No one is trying to connect to me when those messages pop up.

My guess is a port conflict, but i'm not running a web server on my computer

[redge]

port 80 is used on your NAT router as web page for managing your Customer Premise Equipment
maybe, you need to change the default port 80 of your broadband router to port 8080 for stop conflict

[hicksticks2001]

My broadband router is already set to port 8080

any other ideas?

by the way, how do i know if the router i have qualifies as a "NAT router?"

[bevtech]

Do you have a nonroutable Ip like 192.168.0.101 etc?

If so these are non-routable IPs and your router is doing NAT..

[hicksticks2001]

THanks for your help

I realized i had my HTTP Port as 80 as well.

Thanks for helping me get through the problem

[redge]

if you use Skype can conflict with your vncviewer -listen 80
this software use port 80 or 443 for users using broadband NAT router/firewall unconfigured/restricted

if there no restriction, Skype use default port 3841