azkielt, I know you using faucets, so proxy/VPN may be a problem in that case, most faucet owners do not allow (ban users) who use such connection in order to prevent abuse.
Interesting, for now I have no problems with coinpot and I use the raw (proxified) connection with them and even I have received payments from them, and I using the others faucet that you suggest with the normal connection to (no problem either for now).
Thanks to everybody who answer to this post, now I'm using Electrum for Bitcoin (althougt I haven't tested with a transaction yet but I'm sure will work well seeing the positive feedback from this community) and Electrum-Ltc for litecoin with 2 succeed transactions and it works smooth