![]() By default DHCP is enabled in the virtual adapter, so when the NC Services enable the virtual adapter, the TCP/IP stack initiates the DORA process. ![]() The NC service on the client then enables the virtual adapter and passes the VPN tunneling parameters to the virtual adapter driver.4. The SA SSL VPN will then pass down the VPN tunneling parameters (IP address, subnet mask, DNS \ WINS Servers,and VPN Tunnel Server IP address) to the Network Connect (NC) service on the client.3. Note: Ifa DHCP server has been setup with IP address scopes whichare different from the SAs internal IP subnet, refer to KB22611 - Network Connect: Assign IP addresses from a DHCP scope not on the IVE internal interface subnet.2. If DHCP server is used, the SA will begin initiating DORA (Discover, Offer, Request, and ACK) messages to the DHCP server on behalf of the VPN Tunneling client, as in this example:Source Destination Protocol Info10.10.2.25 10.10.2.30 DHCP DHCP Discover10.10.2.30 10.10.2.25 DHCP DHCP Offer10.10.2.25 10.10.2.30 DHCP DHCP Request 10.10.2.30 10.10.2.25 DHCP DHCP ACK There are two possible methods which can be used to obtain an IP address for the VPN tunneling client (Users > Resource Policies > VPN Tunneling > Connection Profile):- DHCP server(s) - IP address poolIf IP address pool configuration is in use, then the SA will automatically select an available IP address from the pool and assign it to the client. The VPN tunneling client tries to make a connection to the SA SSL VPN appliance. If DHCP server(s) are configured, then it initiates DHCP requests to the DHCP server on behalf of the client. IP Address Assignment FlowThe Secure Access (SA) SSL VPN appliance acts as a Dynamic Host Configuration Protocol (DHCP) proxy in order to assign IP addresses to the VPN tunneling client. Ifyou have multiple SAappliances configuredidentically with the sameconnection profile(s), you can use this filter to ensure that the SA only assigns an IP address from the subnet that is configured on the IP Address Filter section of each respective appliance.įor example, if you have a connection profile with the 10.10.10.10-100, 172.16.10.10-100, and 192.168.10.10-100 IP pools configured and an IP address filter of172.16.10.10-100, Alternatively, if these devices are clustered, you can also configure node specific connection profiles.ĭNS Server This may be configured in the Connection Profile or in System >Network >Overview. You may choose toreplace the wildcard filter withan IP address/netmask combinationthat applies to the IP address pool, which you have configured in the connection profile on this device. IP Address Filter (System > Network > VPN Tunneling): By default, wildcard (*) is used to allow any IP address to be assigned from the IP pool, which you have configured. Solution:Configuration RequirementsThe following options must be configured on the SASSL VPNin order for an IP address to be assigned and for the virtual adapter to be configured on the client: NCP Auto-Select Enabled (System >Configuration>NCP)Īccess Control Policy(Users > Resource Policies > VPN Tunneling > Access Control)Ĭonnection Profile (Users > Resource Policies > VPN Tunneling > Connection Profile) It is possible that other configuration issues on the server or client side may also cause this error. This article only documents the basic configuration that is required to setup the tunnel and details how the IPaddress assignment works. Solution: Check IP Address Pools / DHCP server state.Cause:The nc.windows.app.23791 error is a generic errorcodethat is displayed to the end user, each time the SA platform rejects a tunnel setup request. The user access log displays the following message:YY-MM-DD HH:MM:SS - ive - username(Realm) - Network Connect: IP address cannot be allocated to user test. Network Connect symptom:All users receive the The secure gateway denied the connection from this client (nc.windows.app.23791) error message, when they try to logon to SA SSL VPN by using a VPN tunneling client. Junos Pulse Mobile symptom: Junos Pulse status is 'Connected', but the status window does not show an IP address.For more information on the status window, refer to KB26409 - Status window (detailed connection information) for Junos Pulse Mobile connection Junos Pulse Desktop symptom: Junos Pulse status is 'Connected', but the status window does not show an IP address.For more information on the status window, refer to KB26419 -Status window (detailed connection information) for Junos Pulse Desktop connection What SA SSL VPN configuration is required for the VPN tunneling client to obtain an IP addressSummary:This article provides information on how SASSLVPN assigns Internet Protocol (IP) addresses to the VPN tunneling client. ![]()
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