Sean,
After reloading the L6 ware, have you rechecked that the IP address in the HC is still what it was before? This can get reset to defaults and you may need to re-enter. Then go to your Network settings and check the Ethernet IPV4 settings match. Did you also check if you can connect vis USB?
Good luck.
John
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Losmandy G11G2 on pier; refurbed Losmandy G11 with OnStep controller; SkyShed design roll-off observatory; ZWO ASI2600MM-P; ZWO ASI071MC; Sky-Watcher Esprit 100 ED with field flattener; Celestron C925 Edge HD with 0.7XFR, William Optics Zenithstar 61 APO; PHD2, Sequence Generator Pro and PixInsight user