Which servers are you trying?
ecdsa.org: not able to connect
electrum.no-ip.org: problem occurs
electrum.datemas.de: not able to connect
cube.l0g.in: error: not able to connect
electrum.coinwallet.me: problem occurs
electrum.pdmc.net: problem occurs
electrum.drolette.com: problem occurs
electrum.stekprav.pw: problem occurs
btc.it-zone.org: problem occurs
electrum.novit.ro: problem occurs
btc.medioix.com: problem occurs
electrum.hachre.de: problem occurs
electrum.be: problem occurs
so: no success on any server.
can I do a rescan somehow without re-generating the wallet?