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when i switch from LAN to 3G wireless connection Firefox cannot connect when i revert back to LAN

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We have a LAN connection but from time to time I have to use a 3G connection, when I sitch off the 3G connection and revert back to the LAN connection Firefox cannot connect

We have a LAN connection but from time to time I have to use a 3G connection, when I sitch off the 3G connection and revert back to the LAN connection Firefox cannot connect

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Are you restarting Firefox after switching connections?

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Yes, I do restart Firefox