WebTitan OTG 2 for Windows Release Notes
The introduction of the OTG 2 family of agents saw our WebTitan OTG 1 agent being re-architected as a single-threaded application, meaning that the WebTitan OTG 2 agents are more stable and secure and require less CPU overhead from the user machine.
The WebTitan OTG 2 agent family offers several other improvements:
You can remotely manage and configure OTG 2 devices after installation from WebTitan, using the new device management UI.
You can view detailed device information on all your devices in WebTitan and apply global or individual configuration changes.
Reliance on a user's IP address has been removed, with OTG 2 now using an EDNS tag to identify a user and their device.
You can now automatically assign a specific policy to new devices during installation.
OTG 2 uses a customer-specific install key that improves security during installation. The install key can also be regenerated in the WebTitan UI if necessary.
WebTitan OTG 2.2.22 for Windows
August 2025
Why Upgrade?
This release includes a new Maximum Ignorable DNS Failure option that enables smooth transition of the OTG operational states.
What has been improved?
Maximum Ignorable DNS Failure Option: OTG now can ignore a configurable number of DNS test failures before transitioning to Fail Open mode. During Fail Open mode, OTG continually checks for DNS connectivity until connectivity is established, and then resumes normal operations. See MAX_IGNORABLE_DNS_FAILURES=3 in the OTG Installation Parameters for more details.
Stability: Improves sensitivity to react against single DNS failure during regular operation.
What has been fixed?
Additional error logging has been fixed to report root cause.
Library Updates
No library updates were made.
WebTitan OTG 2.2.21 for Windows
Released May 2025
Why Upgrade?
This release includes a new Fail Open option, critical reliability improvements, enhanced VPN compatibility, and updated security libraries. It also brings better recovery behaviors for DNS issues and startup failures. Updates ensure smoother integration with Windows systems and improved support for Fortinet VPN.
What has been improved?
Fail Open Option: OTG now includes a Fail Open mode, reducing the risk of DNS disruption when services are unstable.
Stability: Improvements when initiating a network connectivity checks, reducing false errors during startup and better management of Unbound recovery.
Improved VPN Compatibility: Refactored VPN detection code lets VPN clients manage DNS directly, improving behavior when a VPN is active. Fortinet VPN compatibility has been improved by removing a temporary nameserver setting on shutdown.
More Reliable Reconfiguration: OTG now triggers reconfiguration after an Unbound restart or system resume, improving recovery time and service reliability.
What has been fixed?
Resolved Termination Handling issue.
Additional Error Logging has been fixed.
Fix to use HTTPS as the default for Certificate Downloads.
Library updates
Updated libraries to the latest versions.
WebTitan OTG 2.2.8 for Windows
Released March 2025
We’re excited to announce the release of OTG 2.2.8. This update brings further improvements and package updates.
Why Upgrade?
This release brings further functional and security improvements, fixes, package updates and a digitally signed OTG.
What has been improved?
Simplified capture of diagnostic data: The Diagnostic window has been simplified to a single option for log collection. Log collection gathers the 10 newest log files and creates a zip file, which is now saved in the Documents folder.
What has been fixed?
Solved an issue preventing the installation of OTG on Windows 32bit.
Fix to network detection check on machine resume.
Fixed a minor memory leak.
Fix for JSON config. The fix ensures the ‘interfaces_to_ignore’ entry is honored correctly, specifically when removing a default VPN from the list.
Fixed a potentially exploitable security vulnerability.
Fix to correctly show the full Windows version on the diagnosis window.
Library Updates
Updated libraries to the latest versions.
WebTitan OTG 2.2.5 for Windows
Released: December 2024
We’re excited to announce the release of OTG 2.2.5. This update brings key improvements, bug fixes, and enhanced stability to make your experience even better.
Why Upgrade?
This release focuses on delivering a more stable and efficient OTG. The fixes and enhancements ensure smoother configuration management, better performance, and stronger security. Whether you’re working with IPv6 networks, using VPN adapters, or managing DNS settings, OTG 2.2.5 is designed to make these processes more reliable and seamless.
We recommend updating to OTG 2.2.5 to take full advantage of these improvements.
What has been improved?
VPN Adapter Management: Enhanced detection and management of VPN adapters. OTG now avoids modifying their DNS configurations.
DNS Configuration Updates: For Windows 10 (build 19041 and above), OTG now uses a built-in Windows API to change DNS settings for improved reliability.
Logging: Refined logging output to make it less verbose while maintaining essential details.
Registry Updates: Implemented registry flushing after updating the “DNS Addresses” value to ensure consistent configuration.
Sleep/Resume Handling: Enhanced OTG’s ability to handle device sleep and resume events for smoother operation.
Network Changes: Enhanced detection of network changes for better adaptability.
What has been fixed?
Configuration Deletion Bug: Fixed an issue where OTG could delete a valid configuration if the WTC was unavailable.
DNS Registry Repetition: Addressed a bug that caused DNS server addresses to be repeated under the “DNS Addresses” registry value.
ConfigurationGrabber Exception: Fixed an error in ConfigurationGrabber that prevented proper parsing of DNS address lists.
Library Updates
OpenSSL: Upgraded to version 3.3.2 to stay current with security updates.
Unbound: Updated to version 1.22 for improved DNS resolution capabilities.
WebTitan OTG 2.1 for Windows
Released: November 2021
WebTitan OTG 2 for Windows 2.1 includes some improvements, but it is primarily a bug fix release to strengthen and enhance the product.
What has been improved?
Improvements have been made on the client side to limit instances of a "blocked" status intermittently occurring. Further improvements are planned in later releases.
Additional querying of local DHCP settings has been added for use when detaching from the network interface. This improvement fixed an issue affecting some VPNs, where VPN settings would be kept.
What has been fixed?
Issues causing an OTG 2 device to continuously request reconfiguration have been addressed. This release limits the frequency of such requests.
Resolved an issue causing IPv6 addresses to be stored incorrectly instead of reverting to the correct value.
An issue causing nslookup to not work due to an incorrect IPv6 address has been resolved.
An issue where a user was not being created on WebTitan following OTG 2 install has been resolved.