attack a state judgment must follow the post-conviction remedies offered by that state. A writ of coram nobis is also not available for civil cases. Federal Rule of Civil Procedure 60(b) specifically abolished the writ of coram nobis in civil cases. A petition for a writ of coram nobis may only be filed after a sentence has been served and the petitioner is no longer in custody. A person who is on probation is considered "in custody". Anyone filing a coram nobis petition while in custody will have their petition either denied for lack of jurisdiction or categorized as a petition for a writ of habeas corpus pursuant to 28 U.S.C. § 2255 (or successive 28 U.S.C. § 2255 if the petitioner has previously filed a § 2255 petition). A petition for a writ of coram nobis must be addressed to the sentencing court. To challenge a conviction, the petitioner must send a request for a writ of coram nobis to the court clerk of the district court where the petitioner's conviction originated. In other words, a petitioner must request for the writ in the sentencing court, rather than any convenient federal court. A petition for a writ of coram nobis must provide valid reasons for not attacking the conviction earlier. Petitioners need to show "reasonable diligence", where legitimate justifications exist for not raising challenges to their convictions sooner or through more usual channels (such as a § 2255 petition while in custody). A delay may be considered reasonable when the applicable law was recently changed and made retroactive, when new evidence was discovered that the petitioner could not reasonably have located earlier, or when the petitioner was improperly advised by counsel not to pursue habeas relief. A petition for a writ of coram nobis must raise new issues of law or fact that could not have been raised while the petitioner was in custody. In Morgan, the Court announced the writ was available where no other remedy is available. However, petitioners occasionally misinterpret this statement as an opportunity to re-raise arguments from previous post-conviction petitions. Appellate courts have consistently determined that the writ of coram nobis cannot be used as a "second chance" to challenge a conviction using the same grounds raised in a previous challenge. Petitioners who filed a § 2255 motion and it was denied while in custody must obtain authorization from the district court in order