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CRWS is one of two GUI interfaces for the 800 and SOHO series routers (the other being SDM). It resides in a section of the routers flash memory called webflash. When you want to access CRWS, you open an Internet browser window and type "http://10.10.10.1" in the URL address window (similar to open up Yahoo! website by typing "http://www.yahoo.com").
If accessing the "http://10.10.10.1" does not show anything but bunch of error messages in the page, there is a possibility that the router LAN IP address has changed. To verify and troubleshoot further, there is no other choice but to use CLI. Check out the following FAQ to revive CRWS/SDM via CLI.
»Cisco Forum FAQ »My SDM/CRWS (web configuration mode) doen't work. How do I revive it?
IF CRWS Hangs/Does Not Launch when opening up using Internet Explorer
A common cause of CRWS not working is a known bug in CRWS in which Microsoft Virtual Machine is required for it to run, the subject of this FAQ.
Microsoft Virtual Machine Configuration/Installation
Figure 1(»/showpic/faqs?···&1=1&1=1) Open Internet Explorer and go tools\internet options
Figure 2(»/showpic/faqs?···&1=1&1=1) In the Internet options window, click the advanced tab.
Figure 3(»/showpic/faqs?···&1=1&1=1) Then scroll down and see if there is a main heading for Microsoft VM (if there is no Microsoft VM heading, skip to figure 4). If the Microsoft VM main heading is there, under this heading check the box for JIT compiler for Virtual Machine enabled. Then go to the main heading above it entitled Java (Sun) and uncheck all the checkboxes there. Then click apply, exit out of the window and reboot your PC to save the settings
Figure4 (»/showpic/faqs?···er=0&1=1) - If there is no main heading for Microsoft VM you don't have it, you need this file filename msjavx86.exe - from a trusted website One website is »java-virtual-machine.net/download.html. Download it and (after checking for viruses as you would do with any download, right?) install it (it will ask you to reboot, do so). Then configure Internet Explorer as explained previously in figure 3 above
Figure 5 (»/showpic/faqs?···&1=1&1=1) Go to Windows update to update the Microsoft VM.
Figure 6 (»/showpic/faqs?···&1=1&1=1) Select the VM update(s) and install them, reboot if requested.
Figure 7 (»/showpic/faqs?···&1=1&1=1) Open Internet Explorer, type "http://10.10.10.1", hit enter and CRWS should properly start now.
Note on CRWS usage:
1. leave the LAN IP address at 10.10.10.1, (see figure 7) as changing it can create problems for the router.
2. CRWS allows basic router functionality. It does not allow you to do everthing the router is capable of. Learning the Command Line Interface (CLI) is necessary to make use of all the routers features.
CRWS demo at Cisco website »www.cisco.com/warp/public/779/sm···crws.htm
CRWS description at Cisco website
CRWS User Guide
CRWS software downloads (includes CRWS caveats document, Cisco-speak for bugs)
Switching Between SDM and CRWS