Main office has a Cisco PIX 506. Three remote offices have pix 501s. Yesterday one of the small remote office pix wouldn't establish vpn tunnel so remote computers at the location wouldn't connect back to the office. Today another small office's vpn tunnel wouldn't establish even on reboot. Used some remote support software that provided me on-demand pc remote control of one of the remote desktop systems at the remote office then telneted to the PIX and ran the vpnclinet connect command from the enable prompt. This command re-established the vpn and the computers got through to the main office LAN.
Who knows what the problem is. If I find the problem I will surely post it as it might help someone else.