Fix for isomp:// Protocol Links

Fix for isomp:// Protocol Links | Generated by AI

Home 2026.07

Here is the summary again:

🔍 Decoded `isomp://` URI

The base64 payload decoded to:

[GATEWAY_IP] 12025 mstsc [UUID] rdp [TARGET_IP]

Field	Value
SSO Gateway	`xxx.xxx.x.xx`
Gateway Port	`12025`
Protocol	RDP (Remote Desktop / mstsc)
Session UUID	`xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx`
Target Server	`xxx.xxx.x.xxx`

❌ Problem

The isomp:// protocol handler was missing from Windows Registry, so clicking any isomp:// link did nothing. The IsompSSO client (sso.exe) could not launch automatically.

✅ Fix Applied

Registered the isomp:// protocol in Windows Registry:

.reg file created at: C:\Program Files\IsompSSO\register_isomp.reg

Registry keys added:

HKCR\isomp → URL:IsompSSO Protocol
HKCR\isomp\shell\open\command → "C:\Program Files\IsompSSO\sso.exe" "%1"

This tells Windows to pass any isomp:// URL to sso.exe.

🔧 RDP File Adjustment

In your saved Default.rdp file, changed:

Before	After
`prompt for credentials:i:0`	`prompt for credentials:i:1`

This allows the credentials dialog to appear if automatic authentication fails.

✅ Result

After registering the protocol, sso.exe successfully:

Received the isomp:// URL
Decoded the base64 payload
Authenticated through the SSO gateway using the session UUID
Launched mstsc.exe (Remote Desktop) to connect to the target server

All isomp:// links will now work automatically going forward.

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