SSL VPN on TZ300. Browser based RDP locks up after 5 minutes.
SSLVPN on SonicWALL TZ300 (latest firmware)
Using HTML5-RDP shortcuts. After approx. 5 minutes the connecting "freezes". We can still see the image on the screen, but we can't click on anything.
The debug logs (accessed via the SonicWALL icon in the upper right hand corner of screen) show this error:
"Debug: Connection Closed! (Abnormal Closure) 1006
I've tried this across multiple computers, multiple users, Chrome, Edge, Firefox. Same issue on all.
Category: SSL VPN
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What is your connection speed under the Experience Tab under RDP? the Default setting is "Detect connection quality automatically".
Are you running on Wifi while connected to SSLVPN? You maybe experience a Microsoft RSC issue.
Are you running DPI-SSL (Client or Server)? If so, that maybe causing the issue. Write and access for SSLVPN to LAN and disable DPI in the access rule as indicated by the article below. I am assuming the you are RDP'ing to a device in the LAN zone, if not use the correct Zone.
See if one of these helps.