Add this line to your wallet configuration file:
addnode=seed.boumba.linkpc.net
And then restart your wallet and wait 5 minutes, you should start getting connections
Try to rebuild the index with on of these method:
If you are using a windows wallet, please use the "Rebuild Index" function that can be found in "Tools / Wallet Repair".
If you used the multi-masternode setup script, you can use "prtx_mn1 dl_blocks_n_chains" to redownload the blockchain.
If you set up a linux wallet yourself, shut it down using "printex-cli stop" and then launch it using "printexd -rebuild -daemon"
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